GOG is saying I need to go to Cloud Save Management to cut down my storage use. I've logged in to GOG and looked all over the site and I can't find this. Where is it?

https://www.gog.com/account/cloud-saves/

Than you. I will bookmark this address

This does not work at all; just and endless longin loop.

Works for me. For some reason I had some config files there saved for ECHO even though I don't use Galaxy, maybe it was from years ago when I tried it out. So I deleted them and freed up less than one 1MB of space.

Try a different browser with default settings (no extra adblockers or changes to cookie management etc.). That is what my mother always used to say.

Works perfectly fine.

Check your browser settings (ad/script blockers etc.).