The Content Gating system may have blocked your access to uploading content. This is likely due to your account being too new-- you need to spend some time in VRChat participating in the Community (as the SDK tells you) before you can upload content. This doesn't take too long, be patient!
If you have gotten a message in-app that your access to uploading content has been removed, this is due to your account being flagged as potentially malicious.
If you continue to spend time in VRChat, follow the Community Guidelines, and participate in the Community in a positive manner, your access will eventually be granted (or re-granted, if your access was removed).
Steam accounts cannot ever gain the ability to upload content. Please create a VRChat account!
We cannot and will not bypass the Content Gating system for any users.