The uploading issue is because of a bad XML reference, probably caused by the same issue we were having before due to renaming things.

Go into: \Documents\Paradox Interactive\Age of Wonders Planetfall

Open: Mods_registry.json

Copy your original mod's ID from STEAM and past it in there beside the STEAM ID (which should be incorrect).

And then upload, it worked for me! :smile:

EDIT:
Also, I think it's bad to change the version number in the Package file... seems to not want to let old savegames load it, especially if they are saved on the cloud.