Video & image uploads work fine from Amethyst & Coracle. I haven't tried from any other client besides Flotilla in the last few days.
I had posted a video with a new video client that overwrote my blossom server list. I had changed them back in Amethyst, but nothing else worked correctly after that. I tried Bouquet and Nostrudel's event publisher to try to fix my 10063. That didn't work. Maybe I made things worse but on the surface it appeared the same. I then published my list through Coracle, which fixed Coracle. Prior to all of this, everything worked everywhere. I suppose that's the stuff specific to my case.