diff --git a/lib/shared/messages/multimedia-message-spec.js b/lib/shared/messages/multimedia-message-spec.js
index fc04237ac..11824c7d0 100644
--- a/lib/shared/messages/multimedia-message-spec.js
+++ b/lib/shared/messages/multimedia-message-spec.js
@@ -1,377 +1,378 @@
 // @flow
 
 import invariant from 'invariant';
 
 import {
   pushTypes,
   type MessageSpec,
   type MessageTitleParam,
   type RawMessageInfoFromServerDBRowParams,
 } from './message-spec.js';
 import { joinResult } from './utils.js';
 import {
   contentStringForMediaArray,
   multimediaMessagePreview,
   shimUploadURI,
 } from '../../media/media-utils.js';
 import type { PlatformDetails } from '../../types/device-types.js';
 import type { Media, Video, Image } from '../../types/media-types.js';
 import {
   messageTypes,
   assertMessageType,
   isMediaMessageType,
 } from '../../types/message-types.js';
 import type {
   MessageInfo,
   RawMessageInfo,
   RawMultimediaMessageInfo,
   ClientDBMessageInfo,
 } from '../../types/message-types.js';
 import type {
   ImagesMessageData,
   RawImagesMessageInfo,
   ImagesMessageInfo,
 } from '../../types/messages/images.js';
 import type {
   MediaMessageData,
   MediaMessageInfo,
   RawMediaMessageInfo,
 } from '../../types/messages/media.js';
 import { getMediaMessageServerDBContentsFromMedia } from '../../types/messages/media.js';
 import type { RawUnsupportedMessageInfo } from '../../types/messages/unsupported.js';
 import type { NotifTexts } from '../../types/notif-types.js';
 import type { ThreadInfo } from '../../types/thread-types.js';
 import type { RelativeUserInfo } from '../../types/user-types.js';
 import { ET } from '../../utils/entity-text.js';
 import {
   translateClientDBMediaInfosToMedia,
   translateClientDBMediaInfoToImage,
 } from '../../utils/message-ops-utils.js';
 import { createMediaMessageInfo } from '../message-utils.js';
 import { threadIsGroupChat } from '../thread-utils.js';
 import { hasMinCodeVersion } from '../version-utils.js';
 
 export const multimediaMessageSpec: MessageSpec<
   MediaMessageData | ImagesMessageData,
   RawMediaMessageInfo | RawImagesMessageInfo,
   MediaMessageInfo | ImagesMessageInfo,
 > = Object.freeze({
   messageContentForServerDB(
     data:
       | MediaMessageData
       | ImagesMessageData
       | RawMediaMessageInfo
       | RawImagesMessageInfo,
   ): string {
     if (data.type === messageTypes.MULTIMEDIA) {
       return JSON.stringify(
         getMediaMessageServerDBContentsFromMedia(data.media),
       );
     }
     const mediaIDs = data.media.map(media => parseInt(media.id, 10));
     return JSON.stringify(mediaIDs);
   },
 
   messageContentForClientDB(
     data: RawMediaMessageInfo | RawImagesMessageInfo,
   ): string {
     return this.messageContentForServerDB(data);
   },
 
   rawMessageInfoFromClientDB(
     clientDBMessageInfo: ClientDBMessageInfo,
   ): RawImagesMessageInfo | RawMediaMessageInfo {
     const messageType = assertMessageType(parseInt(clientDBMessageInfo.type));
     invariant(
       isMediaMessageType(messageType),
       'message must be of type IMAGES or MULTIMEDIA',
     );
     invariant(
       clientDBMessageInfo.media_infos !== null &&
         clientDBMessageInfo.media_infos !== undefined,
       `media_infos must be defined`,
     );
 
     let rawMessageInfo: RawImagesMessageInfo | RawMediaMessageInfo =
       messageType === messageTypes.IMAGES
         ? {
             type: messageTypes.IMAGES,
             threadID: clientDBMessageInfo.thread,
             creatorID: clientDBMessageInfo.user,
             time: parseInt(clientDBMessageInfo.time),
             media:
               clientDBMessageInfo.media_infos?.map(
                 translateClientDBMediaInfoToImage,
               ) ?? [],
           }
         : {
             type: messageTypes.MULTIMEDIA,
             threadID: clientDBMessageInfo.thread,
             creatorID: clientDBMessageInfo.user,
             time: parseInt(clientDBMessageInfo.time),
             media: translateClientDBMediaInfosToMedia(clientDBMessageInfo),
           };
 
     if (clientDBMessageInfo.local_id) {
       rawMessageInfo = {
         ...rawMessageInfo,
         localID: clientDBMessageInfo.local_id,
       };
     }
     if (clientDBMessageInfo.id !== clientDBMessageInfo.local_id) {
       rawMessageInfo = {
         ...rawMessageInfo,
         id: clientDBMessageInfo.id,
       };
     }
     return rawMessageInfo;
   },
 
   messageTitle({
     messageInfo,
   }: MessageTitleParam<MediaMessageInfo | ImagesMessageInfo>) {
     const creator = ET.user({ userInfo: messageInfo.creator });
     const preview = multimediaMessagePreview(messageInfo);
     return ET`${creator} ${preview}`;
   },
 
   rawMessageInfoFromServerDBRow(
     row: Object,
     params: RawMessageInfoFromServerDBRowParams,
   ): RawMediaMessageInfo | RawImagesMessageInfo {
     const { localID, media } = params;
     invariant(media, 'Media should be provided');
     return createMediaMessageInfo({
       threadID: row.threadID.toString(),
       creatorID: row.creatorID.toString(),
       media,
       id: row.id.toString(),
       localID,
       time: row.time,
     });
   },
 
   createMessageInfo(
     rawMessageInfo: RawMediaMessageInfo | RawImagesMessageInfo,
     creator: RelativeUserInfo,
   ): ?(MediaMessageInfo | ImagesMessageInfo) {
     if (rawMessageInfo.type === messageTypes.IMAGES) {
       let messageInfo: ImagesMessageInfo = {
         type: messageTypes.IMAGES,
         threadID: rawMessageInfo.threadID,
         creator,
         time: rawMessageInfo.time,
         media: rawMessageInfo.media,
       };
       if (rawMessageInfo.id) {
         messageInfo = { ...messageInfo, id: rawMessageInfo.id };
       }
       if (rawMessageInfo.localID) {
         messageInfo = { ...messageInfo, localID: rawMessageInfo.localID };
       }
       return messageInfo;
     } else if (rawMessageInfo.type === messageTypes.MULTIMEDIA) {
       let messageInfo: MediaMessageInfo = {
         type: messageTypes.MULTIMEDIA,
         threadID: rawMessageInfo.threadID,
         creator,
         time: rawMessageInfo.time,
         media: rawMessageInfo.media,
       };
       if (rawMessageInfo.id) {
         messageInfo = { ...messageInfo, id: rawMessageInfo.id };
       }
       if (rawMessageInfo.localID) {
         messageInfo = { ...messageInfo, localID: rawMessageInfo.localID };
       }
       return messageInfo;
     }
   },
 
   rawMessageInfoFromMessageData(
     messageData: MediaMessageData | ImagesMessageData,
     id: ?string,
   ): RawMediaMessageInfo | RawImagesMessageInfo {
-    if (messageData.type === messageTypes.IMAGES && id) {
-      return ({ ...messageData, id }: RawImagesMessageInfo);
-    } else if (messageData.type === messageTypes.IMAGES) {
-      return ({ ...messageData }: RawImagesMessageInfo);
+    const { sidebarCreation, ...rest } = messageData;
+    if (rest.type === messageTypes.IMAGES && id) {
+      return ({ ...rest, id }: RawImagesMessageInfo);
+    } else if (rest.type === messageTypes.IMAGES) {
+      return ({ ...rest }: RawImagesMessageInfo);
     } else if (id) {
-      return ({ ...messageData, id }: RawMediaMessageInfo);
+      return ({ ...rest, id }: RawMediaMessageInfo);
     } else {
-      return ({ ...messageData }: RawMediaMessageInfo);
+      return ({ ...rest }: RawMediaMessageInfo);
     }
   },
 
   shimUnsupportedMessageInfo(
     rawMessageInfo: RawMediaMessageInfo | RawImagesMessageInfo,
     platformDetails: ?PlatformDetails,
   ): RawMediaMessageInfo | RawImagesMessageInfo | RawUnsupportedMessageInfo {
     if (rawMessageInfo.type === messageTypes.IMAGES) {
       const shimmedRawMessageInfo = shimMediaMessageInfo(
         rawMessageInfo,
         platformDetails,
       );
       return shimmedRawMessageInfo;
     } else {
       const shimmedRawMessageInfo = shimMediaMessageInfo(
         rawMessageInfo,
         platformDetails,
       );
       // TODO figure out first native codeVersion supporting video playback
       if (hasMinCodeVersion(platformDetails, 158)) {
         return shimmedRawMessageInfo;
       }
       const { id } = shimmedRawMessageInfo;
       invariant(id !== null && id !== undefined, 'id should be set on server');
       return {
         type: messageTypes.UNSUPPORTED,
         id,
         threadID: shimmedRawMessageInfo.threadID,
         creatorID: shimmedRawMessageInfo.creatorID,
         time: shimmedRawMessageInfo.time,
         robotext: multimediaMessagePreview(shimmedRawMessageInfo),
         unsupportedMessageInfo: shimmedRawMessageInfo,
       };
     }
   },
 
   unshimMessageInfo(
     unwrapped: RawMediaMessageInfo | RawImagesMessageInfo,
     messageInfo: RawMessageInfo,
   ): ?RawMessageInfo {
     if (unwrapped.type === messageTypes.IMAGES) {
       return {
         ...unwrapped,
         media: unwrapped.media.map(media => {
           if (media.dimensions) {
             return media;
           }
           const dimensions = preDimensionUploads[media.id];
           invariant(
             dimensions,
             'only four photos were uploaded before dimensions were calculated, ' +
               `and ${media.id} was not one of them`,
           );
           return { ...media, dimensions };
         }),
       };
     } else if (unwrapped.type === messageTypes.MULTIMEDIA) {
       for (const { type } of unwrapped.media) {
         if (type !== 'photo' && type !== 'video') {
           return messageInfo;
         }
       }
     }
     return undefined;
   },
 
   async notificationTexts(
     messageInfos: $ReadOnlyArray<MessageInfo>,
     threadInfo: ThreadInfo,
   ): Promise<NotifTexts> {
     const media = [];
     for (const messageInfo of messageInfos) {
       invariant(
         messageInfo.type === messageTypes.IMAGES ||
           messageInfo.type === messageTypes.MULTIMEDIA,
         'messageInfo should be multimedia type!',
       );
       for (const singleMedia of messageInfo.media) {
         media.push(singleMedia);
       }
     }
     const contentString = contentStringForMediaArray(media);
     const creator = ET.user({ userInfo: messageInfos[0].creator });
 
     let body, merged;
     if (!threadInfo.name && !threadIsGroupChat(threadInfo)) {
       body = `sent you ${contentString}`;
       merged = body;
     } else {
       body = `sent ${contentString}`;
       const thread = ET.thread({ display: 'shortName', threadInfo });
       merged = ET`${body} to ${thread}`;
     }
     merged = ET`${creator} ${merged}`;
 
     return {
       merged,
       body,
       title: threadInfo.uiName,
       prefix: ET`${creator}`,
     };
   },
 
   notificationCollapseKey(
     rawMessageInfo: RawMediaMessageInfo | RawImagesMessageInfo,
   ): string {
     // We use the legacy constant here to collapse both types into one
     return joinResult(
       messageTypes.IMAGES,
       rawMessageInfo.threadID,
       rawMessageInfo.creatorID,
     );
   },
 
   generatesNotifs: async () => pushTypes.NOTIF,
 
   includedInRepliesCount: true,
 });
 
 function shimMediaMessageInfo(
   rawMessageInfo: RawMultimediaMessageInfo,
   platformDetails: ?PlatformDetails,
 ): RawMultimediaMessageInfo {
   if (rawMessageInfo.type === messageTypes.IMAGES) {
     let uriChanged = false;
     const newMedia: Image[] = [];
     for (const singleMedia of rawMessageInfo.media) {
       const shimmedURI = shimUploadURI(singleMedia.uri, platformDetails);
       if (shimmedURI === singleMedia.uri) {
         newMedia.push(singleMedia);
       } else {
         newMedia.push(({ ...singleMedia, uri: shimmedURI }: Image));
         uriChanged = true;
       }
     }
     if (!uriChanged) {
       return rawMessageInfo;
     }
     return ({
       ...rawMessageInfo,
       media: newMedia,
     }: RawImagesMessageInfo);
   } else {
     let uriChanged = false;
     const newMedia: Media[] = [];
     for (const singleMedia of rawMessageInfo.media) {
       const shimmedURI = shimUploadURI(singleMedia.uri, platformDetails);
       if (shimmedURI === singleMedia.uri) {
         newMedia.push(singleMedia);
       } else if (singleMedia.type === 'photo') {
         newMedia.push(({ ...singleMedia, uri: shimmedURI }: Image));
         uriChanged = true;
       } else {
         newMedia.push(({ ...singleMedia, uri: shimmedURI }: Video));
         uriChanged = true;
       }
     }
     if (!uriChanged) {
       return rawMessageInfo;
     }
     return ({
       ...rawMessageInfo,
       media: newMedia,
     }: RawMediaMessageInfo);
   }
 }
 
 // Four photos were uploaded before dimensions were calculated server-side,
 // and delivered to clients without dimensions in the MultimediaMessageInfo.
 const preDimensionUploads = {
   '156642': { width: 1440, height: 1080 },
   '156649': { width: 720, height: 803 },
   '156794': { width: 720, height: 803 },
   '156877': { width: 574, height: 454 },
 };
diff --git a/lib/shared/messages/text-message-spec.js b/lib/shared/messages/text-message-spec.js
index 4e4f02d2d..1323eeaf9 100644
--- a/lib/shared/messages/text-message-spec.js
+++ b/lib/shared/messages/text-message-spec.js
@@ -1,207 +1,208 @@
 // @flow
 
 import invariant from 'invariant';
 import * as SimpleMarkdown from 'simple-markdown';
 
 import {
   pushTypes,
   type MessageSpec,
   type RawMessageInfoFromServerDBRowParams,
 } from './message-spec.js';
 import { assertSingleMessageInfo } from './utils.js';
 import { messageTypes } from '../../types/message-types.js';
 import type {
   MessageInfo,
   ClientDBMessageInfo,
 } from '../../types/message-types.js';
 import type {
   RawTextMessageInfo,
   TextMessageData,
   TextMessageInfo,
 } from '../../types/messages/text.js';
 import type { NotifTexts } from '../../types/notif-types.js';
 import type { ThreadInfo } from '../../types/thread-types.js';
 import type { RelativeUserInfo } from '../../types/user-types.js';
 import { ET } from '../../utils/entity-text.js';
 import {
   type ASTNode,
   type SingleASTNode,
   stripSpoilersFromNotifications,
   stripSpoilersFromMarkdownAST,
 } from '../markdown.js';
 import { threadIsGroupChat } from '../thread-utils.js';
 
 /**
  * most of the markdown leaves contain `content` field
  * (it is an array or a string) apart from lists,
  * which have `items` field (that holds an array)
  */
 const rawTextFromMarkdownAST = (node: ASTNode): string => {
   if (Array.isArray(node)) {
     return node.map(rawTextFromMarkdownAST).join('');
   }
   const { content, items } = node;
   if (content && typeof content === 'string') {
     return content;
   } else if (items) {
     return rawTextFromMarkdownAST(items);
   } else if (content) {
     return rawTextFromMarkdownAST(content);
   }
   return '';
 };
 
 const getFirstNonQuotedRawLine = (
   nodes: $ReadOnlyArray<SingleASTNode>,
 ): string => {
   let result = 'message';
   for (const node of nodes) {
     if (node.type === 'blockQuote') {
       result = 'quoted message';
     } else {
       const rawText = rawTextFromMarkdownAST(node);
       if (!rawText || !rawText.replace(/\s/g, '')) {
         // handles the case of an empty(or containing only white spaces)
         // new line that usually occurs between a quote and the rest
         // of the message(we don't want it as a title, thus continue)
         continue;
       }
       return rawText;
     }
   }
   return result;
 };
 
 export const textMessageSpec: MessageSpec<
   TextMessageData,
   RawTextMessageInfo,
   TextMessageInfo,
 > = Object.freeze({
   messageContentForServerDB(
     data: TextMessageData | RawTextMessageInfo,
   ): string {
     return data.text;
   },
 
   messageContentForClientDB(data: RawTextMessageInfo): string {
     return this.messageContentForServerDB(data);
   },
 
   messageTitle({ messageInfo, markdownRules }) {
     const { text } = messageInfo;
     const parser = SimpleMarkdown.parserFor(markdownRules);
     const ast = stripSpoilersFromMarkdownAST(
       parser(text, { disableAutoBlockNewlines: true }),
     );
     return ET`${getFirstNonQuotedRawLine(ast).trim()}`;
   },
 
   rawMessageInfoFromServerDBRow(
     row: Object,
     params: RawMessageInfoFromServerDBRowParams,
   ): RawTextMessageInfo {
     let rawTextMessageInfo: RawTextMessageInfo = {
       type: messageTypes.TEXT,
       id: row.id.toString(),
       threadID: row.threadID.toString(),
       time: row.time,
       creatorID: row.creatorID.toString(),
       text: row.content,
     };
     if (params.localID) {
       rawTextMessageInfo = { ...rawTextMessageInfo, localID: params.localID };
     }
     return rawTextMessageInfo;
   },
 
   rawMessageInfoFromClientDB(
     clientDBMessageInfo: ClientDBMessageInfo,
   ): RawTextMessageInfo {
     let rawTextMessageInfo: RawTextMessageInfo = {
       type: messageTypes.TEXT,
       threadID: clientDBMessageInfo.thread,
       time: parseInt(clientDBMessageInfo.time),
       creatorID: clientDBMessageInfo.user,
       text: clientDBMessageInfo.content ?? '',
     };
     if (clientDBMessageInfo.local_id) {
       rawTextMessageInfo = {
         ...rawTextMessageInfo,
         localID: clientDBMessageInfo.local_id,
       };
     }
     if (clientDBMessageInfo.id !== clientDBMessageInfo.local_id) {
       rawTextMessageInfo = {
         ...rawTextMessageInfo,
         id: clientDBMessageInfo.id,
       };
     }
     return rawTextMessageInfo;
   },
 
   createMessageInfo(
     rawMessageInfo: RawTextMessageInfo,
     creator: RelativeUserInfo,
   ): TextMessageInfo {
     let messageInfo: TextMessageInfo = {
       type: messageTypes.TEXT,
       threadID: rawMessageInfo.threadID,
       creator,
       time: rawMessageInfo.time,
       text: rawMessageInfo.text,
     };
     if (rawMessageInfo.id) {
       messageInfo = { ...messageInfo, id: rawMessageInfo.id };
     }
     if (rawMessageInfo.localID) {
       messageInfo = { ...messageInfo, localID: rawMessageInfo.localID };
     }
     return messageInfo;
   },
 
   rawMessageInfoFromMessageData(
     messageData: TextMessageData,
     id: ?string,
   ): RawTextMessageInfo {
+    const { sidebarCreation, ...rest } = messageData;
     if (id) {
-      return { ...messageData, id };
+      return { ...rest, id };
     } else {
-      return { ...messageData };
+      return { ...rest };
     }
   },
 
   async notificationTexts(
     messageInfos: $ReadOnlyArray<MessageInfo>,
     threadInfo: ThreadInfo,
   ): Promise<NotifTexts> {
     const messageInfo = assertSingleMessageInfo(messageInfos);
     invariant(
       messageInfo.type === messageTypes.TEXT,
       'messageInfo should be messageTypes.TEXT!',
     );
     const notificationTextWithoutSpoilers = stripSpoilersFromNotifications(
       messageInfo.text,
     );
     if (!threadInfo.name && !threadIsGroupChat(threadInfo)) {
       const thread = ET.thread({ display: 'uiName', threadInfo });
       return {
         merged: ET`${thread}: ${notificationTextWithoutSpoilers}`,
         body: notificationTextWithoutSpoilers,
         title: threadInfo.uiName,
       };
     } else {
       const creator = ET.user({ userInfo: messageInfo.creator });
       const thread = ET.thread({ display: 'shortName', threadInfo });
       return {
         merged: ET`${creator} to ${thread}: ${notificationTextWithoutSpoilers}`,
         body: notificationTextWithoutSpoilers,
         title: threadInfo.uiName,
         prefix: ET`${creator}:`,
       };
     }
   },
 
   generatesNotifs: async () => pushTypes.NOTIF,
 
   includedInRepliesCount: true,
 });
diff --git a/lib/types/messages/images.js b/lib/types/messages/images.js
index 360094dcc..c0f441e24 100644
--- a/lib/types/messages/images.js
+++ b/lib/types/messages/images.js
@@ -1,28 +1,33 @@
 // @flow
 
 import type { Image } from '../media-types.js';
 import type { RelativeUserInfo } from '../user-types.js';
 
-export type ImagesMessageData = {
+type ImagesSharedBase = {
   +type: 14,
   +localID?: string, // for optimistic creations. included by new clients
   +threadID: string,
   +creatorID: string,
   +time: number,
   +media: $ReadOnlyArray<Image>,
 };
 
+export type ImagesMessageData = {
+  ...ImagesSharedBase,
+  +sidebarCreation?: boolean,
+};
+
 export type RawImagesMessageInfo = {
-  ...ImagesMessageData,
+  ...ImagesSharedBase,
   +id?: string, // null if local copy without ID yet
 };
 
 export type ImagesMessageInfo = {
   +type: 14,
   +id?: string, // null if local copy without ID yet
   +localID?: string, // for optimistic creations
   +threadID: string,
   +creator: RelativeUserInfo,
   +time: number, // millisecond timestamp
   +media: $ReadOnlyArray<Image>,
 };
diff --git a/lib/types/messages/media.js b/lib/types/messages/media.js
index 4b649ddcd..4a8ed6337 100644
--- a/lib/types/messages/media.js
+++ b/lib/types/messages/media.js
@@ -1,73 +1,78 @@
 // @flow
 
 import type { Media } from '../media-types.js';
 import type { RelativeUserInfo } from '../user-types.js';
 
-export type MediaMessageData = {
+type MediaSharedBase = {
   +type: 15,
   +localID?: string, // for optimistic creations. included by new clients
   +threadID: string,
   +creatorID: string,
   +time: number,
   +media: $ReadOnlyArray<Media>,
 };
 
+export type MediaMessageData = {
+  ...MediaSharedBase,
+  +sidebarCreation?: boolean,
+};
+
 export type RawMediaMessageInfo = {
-  ...MediaMessageData,
+  ...MediaSharedBase,
   +id?: string, // null if local copy without ID yet
 };
 
 export type MediaMessageInfo = {
   +type: 15,
   +id?: string, // null if local copy without ID yet
   +localID?: string, // for optimistic creations
   +threadID: string,
   +creator: RelativeUserInfo,
   +time: number, // millisecond timestamp
   +media: $ReadOnlyArray<Media>,
 };
 
 export type MediaMessageServerDBContent =
   | {
       +type: 'photo',
       +uploadID: string,
     }
   | {
       +type: 'video',
       +uploadID: string,
       +thumbnailUploadID: string,
     };
 
 function getUploadIDsFromMediaMessageServerDBContents(
   mediaMessageContents: $ReadOnlyArray<MediaMessageServerDBContent>,
 ): $ReadOnlyArray<string> {
   const uploadIDs: string[] = [];
   for (const mediaContent of mediaMessageContents) {
     uploadIDs.push(mediaContent.uploadID);
     if (mediaContent.type === 'video') {
       uploadIDs.push(mediaContent.thumbnailUploadID);
     }
   }
   return uploadIDs;
 }
 
 function getMediaMessageServerDBContentsFromMedia(
   media: $ReadOnlyArray<Media>,
 ): $ReadOnlyArray<MediaMessageServerDBContent> {
   return media.map(m => {
     if (m.type === 'photo') {
       return { type: 'photo', uploadID: m.id };
     } else {
       return {
         type: 'video',
         uploadID: m.id,
         thumbnailUploadID: m.thumbnailID,
       };
     }
   });
 }
 
 export {
   getUploadIDsFromMediaMessageServerDBContents,
   getMediaMessageServerDBContentsFromMedia,
 };
diff --git a/lib/types/messages/text.js b/lib/types/messages/text.js
index 932712c4f..fcf7ef08e 100644
--- a/lib/types/messages/text.js
+++ b/lib/types/messages/text.js
@@ -1,27 +1,32 @@
 // @flow
 
 import type { RelativeUserInfo } from '../user-types.js';
 
-export type TextMessageData = {
+type TextSharedBase = {
   +type: 0,
   +localID?: string, // for optimistic creations. included by new clients
   +threadID: string,
   +creatorID: string,
   +time: number,
   +text: string,
 };
 
+export type TextMessageData = {
+  ...TextSharedBase,
+  +sidebarCreation?: boolean,
+};
+
 export type RawTextMessageInfo = {
-  ...TextMessageData,
+  ...TextSharedBase,
   +id?: string, // null if local copy without ID yet
 };
 
 export type TextMessageInfo = {
   +type: 0,
   +id?: string, // null if local copy without ID yet
   +localID?: string, // for optimistic creations
   +threadID: string,
   +creator: RelativeUserInfo,
   +time: number, // millisecond timestamp
   +text: string,
 };