Hey there, have you found any fix at this point?
I am having similar problems and it's been driving me crazy. Uploading FM23 saves to Steam Cloud via Steam Deck has been extremely unreliable. It usually worked after re-trying over and over again.
At first I blamed Steam Deck for this, but I haven't experience the same issues in any other games so far.
And yes, of course I've gone through all the usual tips you find everywhere.
- Restarting Steam Deck
- Updating Steam Deck to latest version (non beta)
- Disabling & Enabling Steam Cloud
- Verifying integrity of game files
- Repairing library folder
One part of the problem seems to have been the limited space available on Steam Cloud. Turns out I have only have about 1GB of Steam Cloud storage available which really isn't enough. Deleting some older files seems to have fixed it at first, but only temporarily if at all. After 8 seasons, the file size for a single save file is over 200MB, so I can barely fit one 3 File Rolling Auto Save (which is the second "smallest" setting) anymore - those 2 file plus the "last save overwrite backup.fm" already make up more then 800MB. And even after changing to "Single File" - which I'm not fully comfortable with - it's still not working.
I'm really running out of options and patience, and unfortunately the tips provided here aren't very helpful either (mostly more of the same). The only thing I haven't tried is "Any custom content enabled for FM; like skins etc. Please uninstall on both systems." - that is a no go for me, especially when there' no guarantee that it fixes anything.
Anyways, the problem is probably mostly on Steam's side here. Still wanted to post here, since the problem is FM specific for me. And that limit of 1GB cloud space absolutely has to be increased, refardless of the sync problems. I'm sure that is something you can affect?
Best regards