Upload a save file and other players can add it to their game with one command.
UGCWrestler_N.sav
Close the game, then open this folder:
%LOCALAPPDATA%\AEWFightForever\Saved\SaveGames
/home/deck/.local/share/Steam/steamapps/compatdata/1913210/pfx/drive_c/users/steamuser/AppData/Local/AEWFightForever/Saved/SaveGames
Wrestlers are in UGCWrestler_N.sav, tag teams in UGCTeam.sav, arenas in UGCArena.sav. To find the wrestler you just made, sort the folder by Date modified: it's the newest UGCWrestler file.
UGCTeam.sav
UGCArena.sav
Don't share UGCWrestler_1.sav (it holds your edits to the real roster) or OnlineInfo.sav (your online account data). A tag team or arena file holds all of your teams or arenas.
UGCWrestler_1.sav
OnlineInfo.sav
Your file holds all of your tag teams (or all your arenas). Players add it with a swap that replaces theirs (after a backup), so it works best as a themed set.
Only share your own creations, and no game files or ripped assets. After sharing you get a manage key: a password for this one upload (there are no accounts) that lets you delete it later.