update: max_media_attachments follow server advertised value (#31616)

app/javascript/mastodon/features/ui/index.jsx

@@ -85,7 +85,7 @@ const mapStateToProps = state => ({
   isComposing: state.getIn(['compose', 'is_composing']),
   hasComposingText: state.getIn(['compose', 'text']).trim().length !== 0,
   hasMediaAttachments: state.getIn(['compose', 'media_attachments']).size > 0,
-  canUploadMore: !state.getIn(['compose', 'media_attachments']).some(x => ['audio', 'video'].includes(x.get('type'))) && state.getIn(['compose', 'media_attachments']).size < 4,
+  canUploadMore: !state.getIn(['compose', 'media_attachments']).some(x => ['audio', 'video'].includes(x.get('type'))) && state.getIn(['compose', 'media_attachments']).size < state.getIn(['server', 'server', 'configuration', 'statuses', 'max_media_attachments']),
   firstLaunch: state.getIn(['settings', 'introductionVersion'], 0) < INTRODUCTION_VERSION,
   username: state.getIn(['accounts', me, 'username']),
 });