diff --git a/app/javascript/mastodon/features/compose/components/upload.js b/app/javascript/mastodon/features/compose/components/upload.js
index 97ac54da9..b08307ade 100644
--- a/app/javascript/mastodon/features/compose/components/upload.js
+++ b/app/javascript/mastodon/features/compose/components/upload.js
@@ -17,7 +17,6 @@ export default class Upload extends ImmutablePureComponent {
     media: ImmutablePropTypes.map.isRequired,
     onUndo: PropTypes.func.isRequired,
     onOpenFocalPoint: PropTypes.func.isRequired,
-    isEditingStatus: PropTypes.bool.isRequired,
   };
 
   handleUndoClick = e => {
@@ -31,7 +30,7 @@ export default class Upload extends ImmutablePureComponent {
   }
 
   render () {
-    const { media, isEditingStatus } = this.props;
+    const { media } = this.props;
     const focusX = media.getIn(['meta', 'focus', 'x']);
     const focusY = media.getIn(['meta', 'focus', 'y']);
     const x = ((focusX /  2) + .5) * 100;
@@ -44,10 +43,10 @@ export default class Upload extends ImmutablePureComponent {
             <div className='compose-form__upload-thumbnail' style={{ transform: `scale(${scale})`, backgroundImage: `url(${media.get('preview_url')})`, backgroundPosition: `${x}% ${y}%` }}>
               <div className='compose-form__upload__actions'>
                 <button type='button' className='icon-button' onClick={this.handleUndoClick}><Icon id='times' /> <FormattedMessage id='upload_form.undo' defaultMessage='Delete' /></button>
-                {!isEditingStatus && (<button type='button' className='icon-button' onClick={this.handleFocalPointClick}><Icon id='pencil' /> <FormattedMessage id='upload_form.edit' defaultMessage='Edit' /></button>)}
+                {!!media.get('unattached') && (<button type='button' className='icon-button' onClick={this.handleFocalPointClick}><Icon id='pencil' /> <FormattedMessage id='upload_form.edit' defaultMessage='Edit' /></button>)}
               </div>
 
-              {(media.get('description') || '').length === 0 && !isEditingStatus && (
+              {(media.get('description') || '').length === 0 && !!media.get('unattached') && (
                 <div className='compose-form__upload__warning'>
                   <button type='button' className='icon-button' onClick={this.handleFocalPointClick}><Icon id='info-circle' /> <FormattedMessage id='upload_form.description_missing' defaultMessage='No description added' /></button>
                 </div>
diff --git a/app/javascript/mastodon/features/compose/containers/upload_container.js b/app/javascript/mastodon/features/compose/containers/upload_container.js
index 1108aec30..05cd2ecc1 100644
--- a/app/javascript/mastodon/features/compose/containers/upload_container.js
+++ b/app/javascript/mastodon/features/compose/containers/upload_container.js
@@ -5,7 +5,6 @@ import { submitCompose } from '../../../actions/compose';
 
 const mapStateToProps = (state, { id }) => ({
   media: state.getIn(['compose', 'media_attachments']).find(item => item.get('id') === id),
-  isEditingStatus: state.getIn(['compose', 'id']) !== null,
 });
 
 const mapDispatchToProps = dispatch => ({
diff --git a/app/javascript/mastodon/reducers/compose.js b/app/javascript/mastodon/reducers/compose.js
index ad384bd0b..afb8b40c1 100644
--- a/app/javascript/mastodon/reducers/compose.js
+++ b/app/javascript/mastodon/reducers/compose.js
@@ -135,7 +135,7 @@ function appendMedia(state, media, file) {
     if (media.get('type') === 'image') {
       media = media.set('file', file);
     }
-    map.update('media_attachments', list => list.push(media));
+    map.update('media_attachments', list => list.push(media.set('unattached', true)));
     map.set('is_uploading', false);
     map.set('is_processing', false);
     map.set('resetFileKey', Math.floor((Math.random() * 0x10000)));
@@ -446,7 +446,7 @@ export default function compose(state = initialState, action) {
       map.set('text', action.raw_text || unescapeHTML(expandMentions(action.status)));
       map.set('in_reply_to', action.status.get('in_reply_to_id'));
       map.set('privacy', action.status.get('visibility'));
-      map.set('media_attachments', action.status.get('media_attachments'));
+      map.set('media_attachments', action.status.get('media_attachments').map((media) => media.set('unattached', true)));
       map.set('focusDate', new Date());
       map.set('caretPosition', null);
       map.set('idempotencyKey', uuid());