Does this help?
If you're having trouble uploading a web build because of the 1k item limit on itch.io, make sure you have a desktop build on your jam page to act as the official submission. And after ensuring your game page has the desktop build, if your game is smaller than 100mb, you can upload it to gd.games using the one-click export feature on GDevelop and share the link on your game jam page for people to play your game through as well.