How to switch places of the post button and image upload? (mobile)

We got a majority of feedback that we should have the post button on the right, it’s for better UX. Any idea how I can switch the places of these two elements? I’ve tried float: right but no luck.

Something like this should get you most of the way there… I haven’t tested it extensively so just keep an eye on things as it may need some additional adjustment in certain contexts.

#reply-control .submit-panel .save-or-cancel {
  flex-direction: row-reverse;
  order: 2;