It looks like migrating file will be possible (fingers crossed). I’m going to setup the forum before I do the data migration so you should be able to access it and test TripleA with it.
I’m fairly certain that Discourse has an API that you can use so I’ll be sure to turn on that functionality.
The issue is resolved now. djensen has informed me, that he freed up some space.
I have already tested it, and new savegames will be uploaded to the forum correctly as well as downloaded to the user’s harddrive.