diff --git a/lib/shared/dm-ops/send-multimedia-message-spec.js b/lib/shared/dm-ops/send-multimedia-message-spec.js
--- a/lib/shared/dm-ops/send-multimedia-message-spec.js
+++ b/lib/shared/dm-ops/send-multimedia-message-spec.js
@@ -4,10 +4,18 @@
   DMOperationSpec,
   ProcessDMOperationUtilities,
 } from './dm-op-spec.js';
-import type { DMSendMultimediaMessageOperation } from '../../types/dm-ops.js';
+import {
+  encryptedMediaBlobURI,
+  encryptedVideoThumbnailBlobURI,
+} from '../../media/media-utils.js';
+import type {
+  DMSendMultimediaMessageOperation,
+  DMBlobOperation,
+} from '../../types/dm-ops.js';
 import { messageTypes } from '../../types/message-types-enum.js';
 import type { MediaMessageData } from '../../types/messages/media.js';
 import type { ClientUpdateInfo } from '../../types/update-types.js';
+import { blobHashFromBlobServiceURI } from '../../utils/blob-service.js';
 import { rawMessageInfoFromMessageData } from '../message-utils.js';
 
 function createMessageDataFromDMOperation(
@@ -23,6 +31,34 @@
   };
 }
 
+function getBlobOpsFromOperation(
+  dmOperation: DMSendMultimediaMessageOperation,
+): Array<DMBlobOperation> {
+  const ops: Array<DMBlobOperation> = [];
+
+  for (const media of dmOperation.media) {
+    if (media.type !== 'encrypted_photo' && media.type !== 'encrypted_video') {
+      continue;
+    }
+    const blobURI = encryptedMediaBlobURI(media);
+    ops.push({
+      type: 'establish_holder',
+      blobHash: blobHashFromBlobServiceURI(blobURI),
+      dmOpType: 'inbound_only',
+    });
+    if (media.type === 'encrypted_video') {
+      const thumbnailBlobURI = encryptedVideoThumbnailBlobURI(media);
+      ops.push({
+        type: 'establish_holder',
+        blobHash: blobHashFromBlobServiceURI(thumbnailBlobURI),
+        dmOpType: 'inbound_only',
+      });
+    }
+  }
+
+  return ops;
+}
+
 const sendMultimediaMessageSpec: DMOperationSpec<DMSendMultimediaMessageOperation> =
   Object.freeze({
     notificationsCreationData: async (
@@ -40,10 +76,11 @@
         rawMessageInfoFromMessageData(messageData, messageID),
       ];
       const updateInfos: Array<ClientUpdateInfo> = [];
+      const blobOps = getBlobOpsFromOperation(dmOperation);
       return {
         rawMessageInfos,
         updateInfos,
-        blobOps: [],
+        blobOps,
       };
     },
     canBeProcessed: async (