diff --git a/res/css/structures/_UploadBar.scss b/res/css/structures/_UploadBar.scss
index 7c62516b47..4fe6773930 100644
--- a/res/css/structures/_UploadBar.scss
+++ b/res/css/structures/_UploadBar.scss
@@ -23,6 +23,12 @@ limitations under the License.
     }
 }
 
+.mx_ThreadView {
+    .mx_UploadBar {
+        padding-left: 0;
+    }
+}
+
 .mx_UploadBar_filename {
     margin-top: 5px;
     color: $muted-fg-color;
diff --git a/src/ContentMessages.tsx b/src/ContentMessages.tsx
index b85c0462b5..7455d76c59 100644
--- a/src/ContentMessages.tsx
+++ b/src/ContentMessages.tsx
@@ -46,6 +46,7 @@ import SettingsStore from "./settings/SettingsStore";
 import { decorateStartSendingTime, sendRoundTripMetric } from "./sendTimePerformanceMetrics";
 
 import { logger } from "matrix-js-sdk/src/logger";
+import { IEventRelation } from "matrix-js-sdk/src";
 
 const MAX_WIDTH = 800;
 const MAX_HEIGHT = 600;
@@ -436,7 +437,12 @@ export default class ContentMessages {
         }
     }
 
-    async sendContentListToRoom(files: File[], roomId: string, matrixClient: MatrixClient) {
+    async sendContentListToRoom(
+        files: File[],
+        roomId: string,
+        relation: IEventRelation | null,
+        matrixClient: MatrixClient,
+    ) {
         if (matrixClient.isGuest()) {
             dis.dispatch({ action: 'require_registration' });
             return;
@@ -512,11 +518,20 @@ export default class ContentMessages {
                     uploadAll = true;
                 }
             }
-            promBefore = this.sendContentToRoom(file, roomId, matrixClient, promBefore);
+            promBefore = this.sendContentToRoom(file, roomId, relation, matrixClient, promBefore);
         }
     }
 
-    getCurrentUploads() {
+    getCurrentUploads(relation?: IEventRelation) {
+        return this.inprogress.filter(upload => {
+            const noRelation = !relation && !upload.relation;
+            const matchingRelation = relation && upload.relation
+                && relation.rel_type === upload.relation.rel_type
+                && relation.event_id === upload.relation.event_id;
+
+            return (noRelation || matchingRelation) && !upload.canceled;
+        });
+
         return this.inprogress.filter(u => !u.canceled);
     }
 
@@ -535,7 +550,13 @@ export default class ContentMessages {
         }
     }
 
-    private sendContentToRoom(file: File, roomId: string, matrixClient: MatrixClient, promBefore: Promise<any>) {
+    private sendContentToRoom(
+        file: File,
+        roomId: string,
+        relation: IEventRelation,
+        matrixClient: MatrixClient,
+        promBefore: Promise<any>,
+    ) {
         const startTime = CountlyAnalytics.getTimestamp();
         const content: IContent = {
             body: file.name || 'Attachment',
@@ -545,6 +566,10 @@ export default class ContentMessages {
             msgtype: "", // set later
         };
 
+        if (relation) {
+            content["m.relates_to"] = relation;
+        }
+
         if (SettingsStore.getValue("Performance.addSendMessageTimingMetadata")) {
             decorateStartSendingTime(content);
         }
@@ -590,7 +615,8 @@ export default class ContentMessages {
 
         const upload: IUpload = {
             fileName: file.name || 'Attachment',
-            roomId: roomId,
+            roomId,
+            relation,
             total: file.size,
             loaded: 0,
             promise: prom,
diff --git a/src/components/structures/RoomView.tsx b/src/components/structures/RoomView.tsx
index 33fde6e509..03cca683ae 100644
--- a/src/components/structures/RoomView.tsx
+++ b/src/components/structures/RoomView.tsx
@@ -786,7 +786,7 @@ export class RoomView extends React.Component<IRoomProps, IRoomState> {
                 break;
             case 'picture_snapshot':
                 ContentMessages.sharedInstance().sendContentListToRoom(
-                    [payload.file], this.state.room.roomId, this.context);
+                    [payload.file], this.state.room.roomId, null, this.context);
                 break;
             case 'notifier_enabled':
             case Action.UploadStarted:
@@ -1292,7 +1292,7 @@ export class RoomView extends React.Component<IRoomProps, IRoomState> {
         ev.stopPropagation();
         ev.preventDefault();
         ContentMessages.sharedInstance().sendContentListToRoom(
-            ev.dataTransfer.files, this.state.room.roomId, this.context,
+            ev.dataTransfer.files, this.state.room.roomId, null, this.context,
         );
         dis.fire(Action.FocusSendMessageComposer);
 
diff --git a/src/components/structures/ThreadView.tsx b/src/components/structures/ThreadView.tsx
index 17895be9d1..8cdc560df8 100644
--- a/src/components/structures/ThreadView.tsx
+++ b/src/components/structures/ThreadView.tsx
@@ -15,7 +15,7 @@ limitations under the License.
 */
 
 import React from 'react';
-import { MatrixEvent, Room } from 'matrix-js-sdk/src';
+import { IEventRelation, MatrixEvent, Room } from 'matrix-js-sdk/src';
 import { Thread, ThreadEvent } from 'matrix-js-sdk/src/models/thread';
 import { RelationType } from 'matrix-js-sdk/src/@types/event';
 
@@ -37,6 +37,8 @@ import { MatrixClientPeg } from '../../MatrixClientPeg';
 import { E2EStatus } from '../../utils/ShieldUtils';
 import EditorStateTransfer from '../../utils/EditorStateTransfer';
 import RoomContext, { TimelineRenderingType } from '../../contexts/RoomContext';
+import ContentMessages from '../../ContentMessages';
+import UploadBar from './UploadBar';
 import { ChevronFace, ContextMenuTooltipButton } from './ContextMenu';
 import { _t } from '../../languageHandler';
 import IconizedContextMenu, {
@@ -304,6 +306,12 @@ export default class ThreadView extends React.Component<IProps, IState> {
         const highlightedEventId = this.props.initialEventHighlighted
             ? this.props.initialEvent?.getId()
             : null;
+
+        const threadRelation: IEventRelation = {
+            rel_type: RelationType.Thread,
+            event_id: this.state.thread?.id,
+        };
+
         return (
             <RoomContext.Provider value={{
                 ...this.context,
@@ -343,13 +351,14 @@ export default class ThreadView extends React.Component<IProps, IState> {
                         />
                     ) }
 
+                    { ContentMessages.sharedInstance().getCurrentUploads(threadRelation).length > 0 && (
+                        <UploadBar room={this.props.room} relation={threadRelation} />
+                    ) }
+
                     { this.state?.thread?.timelineSet && (<MessageComposer
                         room={this.props.room}
                         resizeNotifier={this.props.resizeNotifier}
-                        relation={{
-                            rel_type: RelationType.Thread,
-                            event_id: this.state.thread.id,
-                        }}
+                        relation={threadRelation}
                         replyToEvent={this.state.replyToEvent}
                         permalinkCreator={this.props.permalinkCreator}
                         e2eStatus={this.props.e2eStatus}
diff --git a/src/components/structures/UploadBar.tsx b/src/components/structures/UploadBar.tsx
index 6ee53da5d1..d3ca6142bb 100644
--- a/src/components/structures/UploadBar.tsx
+++ b/src/components/structures/UploadBar.tsx
@@ -27,9 +27,11 @@ import AccessibleButton from "../views/elements/AccessibleButton";
 import { IUpload } from "../../models/IUpload";
 import { replaceableComponent } from "../../utils/replaceableComponent";
 import MatrixClientContext from "../../contexts/MatrixClientContext";
+import { IEventRelation } from 'matrix-js-sdk/src';
 
 interface IProps {
     room: Room;
+    relation?: IEventRelation;
 }
 
 interface IState {
@@ -64,7 +66,7 @@ export default class UploadBar extends React.Component<IProps, IState> {
     }
 
     private getUploadsInRoom(): IUpload[] {
-        const uploads = ContentMessages.sharedInstance().getCurrentUploads();
+        const uploads = ContentMessages.sharedInstance().getCurrentUploads(this.props.relation);
         return uploads.filter(u => u.roomId === this.props.room.roomId);
     }
 
diff --git a/src/components/views/rooms/MessageComposer.tsx b/src/components/views/rooms/MessageComposer.tsx
index 8075082dbf..a9bf62f887 100644
--- a/src/components/views/rooms/MessageComposer.tsx
+++ b/src/components/views/rooms/MessageComposer.tsx
@@ -128,6 +128,7 @@ const EmojiButton: React.FC<IEmojiButtonProps> = ({ addEmoji, menuPosition, narr
 
 interface IUploadButtonProps {
     roomId: string;
+    relation?: IEventRelation | null;
 }
 
 class UploadButton extends React.Component<IUploadButtonProps> {
@@ -169,7 +170,7 @@ class UploadButton extends React.Component<IUploadButtonProps> {
         }
 
         ContentMessages.sharedInstance().sendContentListToRoom(
-            tfiles, this.props.roomId, MatrixClientPeg.get(),
+            tfiles, this.props.roomId, this.props.relation, MatrixClientPeg.get(),
         );
 
         // This is the onChange handler for a file form control, but we're
@@ -479,7 +480,11 @@ export default class MessageComposer extends React.Component<IProps, IState> {
                 );
             }
             buttons.push(
-                <UploadButton key="controls_upload" roomId={this.props.room.roomId} />,
+                <UploadButton
+                    key="controls_upload"
+                    roomId={this.props.room.roomId}
+                    relation={this.props.relation}
+                />,
             );
             buttons.push(
                 <EmojiButton key="emoji_button" addEmoji={this.addEmoji} menuPosition={menuPosition} narrowMode={this.state.narrowMode} />,
diff --git a/src/components/views/rooms/SendMessageComposer.tsx b/src/components/views/rooms/SendMessageComposer.tsx
index 35bc85ba23..cda78c36b0 100644
--- a/src/components/views/rooms/SendMessageComposer.tsx
+++ b/src/components/views/rooms/SendMessageComposer.tsx
@@ -615,7 +615,7 @@ export class SendMessageComposer extends React.Component<ISendMessageComposerPro
         // it puts the filename in as text/plain which we want to ignore.
         if (clipboardData.files.length && !clipboardData.types.includes("text/rtf")) {
             ContentMessages.sharedInstance().sendContentListToRoom(
-                Array.from(clipboardData.files), this.props.room.roomId, this.props.mxClient,
+                Array.from(clipboardData.files), this.props.room.roomId, this.props.relation, this.props.mxClient,
             );
             return true; // to skip internal onPaste handler
         }
diff --git a/src/models/IUpload.ts b/src/models/IUpload.ts
index 1b5a13e394..a3599195d8 100644
--- a/src/models/IUpload.ts
+++ b/src/models/IUpload.ts
@@ -14,11 +14,13 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+import { IEventRelation } from "matrix-js-sdk/src";
 import { IAbortablePromise } from "matrix-js-sdk/src/@types/partials";
 
 export interface IUpload {
     fileName: string;
     roomId: string;
+    relation?: IEventRelation;
     total: number;
     loaded: number;
     promise: IAbortablePromise<any>;