Hello @Alex02 I am contacting you via this route because I am new to the forum and I cannot consult you privately.
2 years ago you published this post: dev-kit-unable-to-upload-mod-on-steam/27220
It turns out that the same thing is happening to me and you are the only reference I have. I see that you could continue developing with the dev kit.
Could you tell me how you solved this problem? I published a post making the same query.
Thank you!