It does seem to just be on connect. I was able to submit a post on the browser just fine
The problem is that it's hidden in the "post Url" section when creating a new post. When u press the arrow uo it opens the android file selector
and now I can't edit my own post anymore after I tried to embed my screenshot :-/ The UX for editing a comment is quite frustrating anyway, kind of have to long press twice on your own comment and hope the edit symbol shows up somehow