I am attempting to reupload an edited version of an avatar that I just deleted as I wasn’t bothered to relaunch the game to see changes, but every time I attempt to upload the avatar just creates a new prefab and doesn’t even open up the menu.
You probably want to check for errors in the unity console. In that window you can show or hide the message types, error, info, warning.
Maybe it’s related to execution order, but in my experience older tools in a project can break because of changes to the SDK, and anything in the project can flummox the SDK and cause interesting and tricky to google errors.
If you’re getting random prefabs, that’s a good sign that the SDK wants to work. Those are supposed to be packaged up, uploaded and removed without you seeing them.