diff --git a/native/chat/multimedia-message-tooltip-button.react.js b/native/chat/multimedia-message-tooltip-button.react.js
--- a/native/chat/multimedia-message-tooltip-button.react.js
+++ b/native/chat/multimedia-message-tooltip-button.react.js
@@ -3,12 +3,21 @@
 import * as React from 'react';
 import Animated from 'react-native-reanimated';
 
+import { localIDPrefix } from 'lib/shared/message-utils';
+import { useCanCreateReactionFromMessage } from 'lib/shared/reaction-utils';
+import type { SetState } from 'lib/types/hook-types';
+
 import type { AppNavigationProp } from '../navigation/app-navigator.react';
 import type { TooltipRoute } from '../navigation/tooltip.react';
 import { useSelector } from '../redux/redux-utils';
 import { TooltipInlineEngagement } from './inline-engagement.react';
 import { InnerMultimediaMessage } from './inner-multimedia-message.react';
 import { MessageHeader } from './message-header.react';
+import {
+  useSendReaction,
+  useReactionSelectionPopoverPosition,
+} from './reaction-message-utils';
+import ReactionSelectionPopover from './reaction-selection-popover.react';
 import SidebarInputBarHeightMeasurer from './sidebar-input-bar-height-measurer.react';
 import { useAnimatedMessageTooltipButton } from './utils';
 
@@ -23,10 +32,12 @@
   +route: TooltipRoute<'MultimediaMessageTooltipModal'>,
   +progress: Node,
   +isOpeningSidebar: boolean,
+  +setHideTooltip: SetState<boolean>,
 };
 function MultimediaMessageTooltipButton(props: Props): React.Node {
+  const { navigation, progress, isOpeningSidebar, setHideTooltip } = props;
+
   const windowWidth = useSelector(state => state.dimensions.width);
-  const { progress } = props;
 
   const [
     sidebarInputBarHeight,
@@ -36,7 +47,13 @@
     setSidebarInputBarHeight(height);
   }, []);
 
-  const { item, verticalBounds, initialCoordinates } = props.route.params;
+  const {
+    item,
+    verticalBounds,
+    initialCoordinates,
+    margin,
+  } = props.route.params;
+
   const { style: messageContainerStyle } = useAnimatedMessageTooltipButton({
     sourceMessage: item,
     initialCoordinates,
@@ -61,8 +78,6 @@
     };
   }, [initialCoordinates.height, initialCoordinates.x, progress, windowWidth]);
 
-  const { navigation, isOpeningSidebar } = props;
-
   const inlineEngagement = React.useMemo(() => {
     if (!item.threadCreatedFromMessage) {
       return null;
@@ -79,6 +94,46 @@
     );
   }, [initialCoordinates, isOpeningSidebar, item, progress, windowWidth]);
 
+  const { messageInfo, threadInfo, reactions } = item;
+  const nextLocalID = useSelector(state => state.nextLocalID);
+  const localID = `${localIDPrefix}${nextLocalID}`;
+
+  const canCreateReactionFromMessage = useCanCreateReactionFromMessage(
+    threadInfo,
+    messageInfo,
+  );
+
+  const sendReaction = useSendReaction(messageInfo.id, localID, threadInfo.id);
+
+  const reactionSelectionPopoverPosition = useReactionSelectionPopoverPosition({
+    initialCoordinates,
+    verticalBounds,
+    margin,
+  });
+
+  const reactionSelectionPopover = React.useMemo(() => {
+    if (!canCreateReactionFromMessage) {
+      return null;
+    }
+
+    return (
+      <ReactionSelectionPopover
+        reactions={reactions}
+        setHideTooltip={setHideTooltip}
+        reactionSelectionPopoverContainerStyle={
+          reactionSelectionPopoverPosition
+        }
+        sendReaction={sendReaction}
+      />
+    );
+  }, [
+    canCreateReactionFromMessage,
+    reactionSelectionPopoverPosition,
+    reactions,
+    sendReaction,
+    setHideTooltip,
+  ]);
+
   return (
     <Animated.View style={messageContainerStyle}>
       <SidebarInputBarHeightMeasurer
@@ -88,6 +143,7 @@
       <Animated.View style={headerStyle}>
         <MessageHeader item={item} focused={true} display="modal" />
       </Animated.View>
+      {reactionSelectionPopover}
       <InnerMultimediaMessage
         item={item}
         verticalBounds={verticalBounds}
diff --git a/native/chat/reaction-selection-popover.react.js b/native/chat/reaction-selection-popover.react.js
new file mode 100644
--- /dev/null
+++ b/native/chat/reaction-selection-popover.react.js
@@ -0,0 +1,100 @@
+// @flow
+
+import * as React from 'react';
+import { View, TouchableOpacity, Text } from 'react-native';
+
+import type { MessageReactionInfo } from 'lib/selectors/chat-selectors';
+import type { SetState } from 'lib/types/hook-types';
+
+import { useStyles } from '../themes/colors';
+import type { ViewStyle } from '../types/styles';
+
+type ReactionSelectionPopoverProps = {
+  +reactions: $ReadOnlyMap<string, MessageReactionInfo>,
+  +setHideTooltip: SetState<boolean>,
+  +reactionSelectionPopoverContainerStyle: ViewStyle,
+  +sendReaction: (
+    reaction: string,
+    action: 'add_reaction' | 'remove_reaction',
+  ) => mixed,
+};
+
+function ReactionSelectionPopover(
+  props: ReactionSelectionPopoverProps,
+): React.Node {
+  const {
+    reactions,
+    setHideTooltip,
+    reactionSelectionPopoverContainerStyle,
+    sendReaction,
+  } = props;
+
+  const styles = useStyles(unboundStyles);
+
+  const containerStyle = React.useMemo(
+    () => [
+      styles.reactionSelectionPopoverContainer,
+      reactionSelectionPopoverContainerStyle,
+    ],
+    [
+      reactionSelectionPopoverContainerStyle,
+      styles.reactionSelectionPopoverContainer,
+    ],
+  );
+
+  const onPressDefaultEmoji = React.useCallback(
+    (emoji: string) => {
+      const reactionInput = emoji;
+      const viewerReacted = !!reactions.get(reactionInput)?.viewerReacted;
+      const action = viewerReacted ? 'remove_reaction' : 'add_reaction';
+
+      sendReaction(reactionInput, action);
+      setHideTooltip(true);
+    },
+    [reactions, sendReaction, setHideTooltip],
+  );
+
+  const defaultEmojis = React.useMemo(() => {
+    const defaultEmojisData = ['❤️', '😆', '😮', '😠', '👍'];
+
+    return defaultEmojisData.map(emoji => (
+      <TouchableOpacity key={emoji} onPress={() => onPressDefaultEmoji(emoji)}>
+        <View style={styles.reactionSelectionItemContainer}>
+          <Text style={styles.reactionSelectionItemEmoji}>{emoji}</Text>
+        </View>
+      </TouchableOpacity>
+    ));
+  }, [
+    onPressDefaultEmoji,
+    styles.reactionSelectionItemContainer,
+    styles.reactionSelectionItemEmoji,
+  ]);
+
+  return <View style={containerStyle}>{defaultEmojis}</View>;
+}
+
+const unboundStyles = {
+  reactionSelectionPopoverContainer: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    backgroundColor: 'tooltipBackground',
+    padding: 8,
+    borderRadius: 8,
+    flex: 1,
+  },
+  reactionSelectionItemContainer: {
+    backgroundColor: 'reactionSelectionPopoverItemBackground',
+    justifyContent: 'center',
+    alignItems: 'center',
+    padding: 8,
+    borderRadius: 20,
+    width: 40,
+    height: 40,
+    marginRight: 12,
+  },
+  reactionSelectionItemEmoji: {
+    fontSize: 18,
+  },
+};
+
+export default ReactionSelectionPopover;
diff --git a/native/chat/robotext-message-tooltip-button.react.js b/native/chat/robotext-message-tooltip-button.react.js
--- a/native/chat/robotext-message-tooltip-button.react.js
+++ b/native/chat/robotext-message-tooltip-button.react.js
@@ -3,11 +3,20 @@
 import * as React from 'react';
 import Animated from 'react-native-reanimated';
 
+import { localIDPrefix } from 'lib/shared/message-utils';
+import { useCanCreateReactionFromMessage } from 'lib/shared/reaction-utils';
+import type { SetState } from 'lib/types/hook-types';
+
 import type { AppNavigationProp } from '../navigation/app-navigator.react';
 import type { TooltipRoute } from '../navigation/tooltip.react';
 import { useSelector } from '../redux/redux-utils';
 import { TooltipInlineEngagement } from './inline-engagement.react';
 import { InnerRobotextMessage } from './inner-robotext-message.react';
+import {
+  useSendReaction,
+  useReactionSelectionPopoverPosition,
+} from './reaction-message-utils';
+import ReactionSelectionPopover from './reaction-selection-popover.react';
 import SidebarInputBarHeightMeasurer from './sidebar-input-bar-height-measurer.react';
 import { Timestamp } from './timestamp.react';
 import { useAnimatedMessageTooltipButton } from './utils';
@@ -21,9 +30,11 @@
   +route: TooltipRoute<'RobotextMessageTooltipModal'>,
   +progress: Node,
   +isOpeningSidebar: boolean,
+  +setHideTooltip: SetState<boolean>,
 };
 function RobotextMessageTooltipButton(props: Props): React.Node {
-  const { progress } = props;
+  const { navigation, progress, isOpeningSidebar, setHideTooltip } = props;
+
   const windowWidth = useSelector(state => state.dimensions.width);
 
   const [
@@ -34,7 +45,13 @@
     setSidebarInputBarHeight(height);
   }, []);
 
-  const { item, verticalBounds, initialCoordinates } = props.route.params;
+  const {
+    item,
+    verticalBounds,
+    initialCoordinates,
+    margin,
+  } = props.route.params;
+
   const { style: messageContainerStyle } = useAnimatedMessageTooltipButton({
     sourceMessage: item,
     initialCoordinates,
@@ -59,8 +76,6 @@
     };
   }, [initialCoordinates.height, initialCoordinates.x, progress, windowWidth]);
 
-  const { navigation, isOpeningSidebar } = props;
-
   const inlineEngagement = React.useMemo(() => {
     if (!item.threadCreatedFromMessage) {
       return null;
@@ -77,6 +92,46 @@
     );
   }, [initialCoordinates, isOpeningSidebar, item, progress, windowWidth]);
 
+  const { messageInfo, threadInfo, reactions } = item;
+  const nextLocalID = useSelector(state => state.nextLocalID);
+  const localID = `${localIDPrefix}${nextLocalID}`;
+
+  const canCreateReactionFromMessage = useCanCreateReactionFromMessage(
+    threadInfo,
+    messageInfo,
+  );
+
+  const sendReaction = useSendReaction(messageInfo.id, localID, threadInfo.id);
+
+  const reactionSelectionPopoverPosition = useReactionSelectionPopoverPosition({
+    initialCoordinates,
+    verticalBounds,
+    margin,
+  });
+
+  const reactionSelectionPopover = React.useMemo(() => {
+    if (!canCreateReactionFromMessage) {
+      return null;
+    }
+
+    return (
+      <ReactionSelectionPopover
+        reactions={reactions}
+        setHideTooltip={setHideTooltip}
+        reactionSelectionPopoverContainerStyle={
+          reactionSelectionPopoverPosition
+        }
+        sendReaction={sendReaction}
+      />
+    );
+  }, [
+    canCreateReactionFromMessage,
+    reactionSelectionPopoverPosition,
+    reactions,
+    sendReaction,
+    setHideTooltip,
+  ]);
+
   return (
     <Animated.View style={messageContainerStyle}>
       <SidebarInputBarHeightMeasurer
@@ -86,6 +141,7 @@
       <Animated.View style={headerStyle}>
         <Timestamp time={item.messageInfo.time} display="modal" />
       </Animated.View>
+      {reactionSelectionPopover}
       <InnerRobotextMessage item={item} onPress={navigation.goBackOnce} />
       {inlineEngagement}
     </Animated.View>
diff --git a/native/chat/text-message-tooltip-button.react.js b/native/chat/text-message-tooltip-button.react.js
--- a/native/chat/text-message-tooltip-button.react.js
+++ b/native/chat/text-message-tooltip-button.react.js
@@ -3,6 +3,10 @@
 import * as React from 'react';
 import Animated from 'react-native-reanimated';
 
+import { localIDPrefix } from 'lib/shared/message-utils';
+import { useCanCreateReactionFromMessage } from 'lib/shared/reaction-utils';
+import type { SetState } from 'lib/types/hook-types';
+
 import type { AppNavigationProp } from '../navigation/app-navigator.react';
 import type { TooltipRoute } from '../navigation/tooltip.react';
 import { useSelector } from '../redux/redux-utils';
@@ -11,6 +15,11 @@
 import { MessageHeader } from './message-header.react';
 import { MessageListContextProvider } from './message-list-types';
 import { MessagePressResponderContext } from './message-press-responder-context';
+import {
+  useSendReaction,
+  useReactionSelectionPopoverPosition,
+} from './reaction-message-utils';
+import ReactionSelectionPopover from './reaction-selection-popover.react';
 import SidebarInputBarHeightMeasurer from './sidebar-input-bar-height-measurer.react';
 import { useAnimatedMessageTooltipButton } from './utils';
 
@@ -23,9 +32,11 @@
   +route: TooltipRoute<'TextMessageTooltipModal'>,
   +progress: Node,
   +isOpeningSidebar: boolean,
+  +setHideTooltip: SetState<boolean>,
 };
 function TextMessageTooltipButton(props: Props): React.Node {
-  const { progress } = props;
+  const { navigation, progress, isOpeningSidebar, setHideTooltip } = props;
+
   const windowWidth = useSelector(state => state.dimensions.width);
 
   const [
@@ -36,7 +47,13 @@
     setSidebarInputBarHeight(height);
   }, []);
 
-  const { item, verticalBounds, initialCoordinates } = props.route.params;
+  const {
+    item,
+    verticalBounds,
+    initialCoordinates,
+    margin,
+  } = props.route.params;
+
   const {
     style: messageContainerStyle,
     threadColorOverride,
@@ -66,7 +83,6 @@
   }, [initialCoordinates.height, initialCoordinates.x, progress, windowWidth]);
 
   const threadID = item.threadInfo.id;
-  const { navigation, isOpeningSidebar } = props;
 
   const messagePressResponderContext = React.useMemo(
     () => ({
@@ -90,6 +106,47 @@
       />
     );
   }, [initialCoordinates, isOpeningSidebar, item, progress, windowWidth]);
+
+  const { messageInfo, threadInfo, reactions } = item;
+  const nextLocalID = useSelector(state => state.nextLocalID);
+  const localID = `${localIDPrefix}${nextLocalID}`;
+
+  const canCreateReactionFromMessage = useCanCreateReactionFromMessage(
+    threadInfo,
+    messageInfo,
+  );
+
+  const sendReaction = useSendReaction(messageInfo.id, localID, threadInfo.id);
+
+  const reactionSelectionPopoverPosition = useReactionSelectionPopoverPosition({
+    initialCoordinates,
+    verticalBounds,
+    margin,
+  });
+
+  const reactionSelectionPopover = React.useMemo(() => {
+    if (!canCreateReactionFromMessage) {
+      return null;
+    }
+
+    return (
+      <ReactionSelectionPopover
+        reactions={reactions}
+        setHideTooltip={setHideTooltip}
+        reactionSelectionPopoverContainerStyle={
+          reactionSelectionPopoverPosition
+        }
+        sendReaction={sendReaction}
+      />
+    );
+  }, [
+    canCreateReactionFromMessage,
+    reactionSelectionPopoverPosition,
+    reactions,
+    sendReaction,
+    setHideTooltip,
+  ]);
+
   return (
     <MessageListContextProvider threadID={threadID}>
       <SidebarInputBarHeightMeasurer
@@ -100,6 +157,7 @@
         <Animated.View style={headerStyle}>
           <MessageHeader item={item} focused={true} display="modal" />
         </Animated.View>
+        {reactionSelectionPopover}
         <MessagePressResponderContext.Provider
           value={messagePressResponderContext}
         >
diff --git a/native/navigation/tooltip.react.js b/native/navigation/tooltip.react.js
--- a/native/navigation/tooltip.react.js
+++ b/native/navigation/tooltip.react.js
@@ -111,6 +111,7 @@
   ...Base,
   +progress: Node,
   +isOpeningSidebar: boolean,
+  +setHideTooltip: SetState<boolean>,
 };
 type TooltipProps<Base> = {
   ...Base,
@@ -510,6 +511,7 @@
         ...navAndRouteForFlow,
         progress: position,
         isOpeningSidebar,
+        setHideTooltip,
       };
 
       const itemsStyles = [styles.items, styles.itemsFixed];
diff --git a/native/themes/colors.js b/native/themes/colors.js
--- a/native/themes/colors.js
+++ b/native/themes/colors.js
@@ -68,6 +68,7 @@
   panelSecondaryForegroundBorder: '#CCCCCC',
   purpleLink: '#7E57C2',
   purpleButton: '#7E57C2',
+  reactionSelectionPopoverItemBackground: '#404040',
   redText: '#F53100',
   spoiler: '#33332C',
   tabBarAccent: '#7E57C2',
@@ -151,6 +152,7 @@
   panelSecondaryForegroundBorder: '#666666',
   purpleLink: '#AE94DB',
   purpleButton: '#7E57C2',
+  reactionSelectionPopoverItemBackground: '#404040',
   redText: '#F53100',
   spoiler: '#33332C',
   tabBarAccent: '#AE94DB',