That gif of the raccoon is 34MB, so if that's working instead of hanging for an unreasonable amount of time, then I'm calling it partially fixed.

The fix that has been applied was I corrected a race in the media reverse-proxy that I had hacked into Revolver a while back, and the *correct* fix is I go back to writing Elixir for a minute to make Pleroma use Revolver as an uploader.
ytcracker--earthbound--adventures_of_the_sound_stone_vol._1--02_choose_a_file.mp3