Also, trying to Upload Picture in a user Profile, not having php-gd installed leads to a confusing error message not listing any file formats:
This server only supports these image formats: .

I just realized that src/applications/config/check/PhabricatorGDSetupCheck.php exists. Thus please ignore my last comment. Still, things should fail gracefully instead of showing an exception.

Pseudo code, not tested as other exceptions block me from testing:

Just some notes for later

Hi @Dylsss thanks again for your improvement. Have you any idea about why that message happens?

No errors in the console..

By the way I understand that manually putting something like {F123} in the article should allow to manually attach that file to the Phame Post object. So, I see and agree this is a separated problem related to Phame.

Can I ask you if you are on latest version? If yes, can I ask you if you have errors in your console? if yes, see this:

I encountered this, when upgrading from Phabricator, during last step, ./bin/cache purge --all:

I start triaging this to Normal priority since this problem creates situations that don't happen with many proprietary weird alternatives like Trello, Asana etc., where their Drag & Drop "just works" since their file are always visible to all members and so it's considered as "working" for their end-users (well, thanks to the fact that Trello etc. have a terrible permission management system, thousand years back from Phorge, and they really have no concept of "single file permission", and so they win easy in these confrontations where the user expects something basic and it doesn't happen as default by some of our "attach to something" corner cases).