[Are you guys having trouble uploading a save?]

Not sure what your specific issue is, but for me, I had to fix some problems on my existing server save in singleplayer. When I went to reupload it, it would only work if I renamed the .db and .fwl files to something new before zipping uploading.

[Valheim+ config form doesn't respect Disable Food Degradation setting]

As the title says. Any time the form is used to edit valheim_plus.cfg, Disable Food Degradation boolean is always written to false, regardless of the selected form value, and regardless of previous setting in valheim_plus.cfg. This means manual edits via FTP will be overwritten on form use. Judging from a couple of other posts, this might not be the only setting that this happens with.

[V+ - incompatible version out of nowhere]

There was a minor patch to the game, and Steam likely auto-updated your client. Restart the server so it can update its version.