Connecting/Register to a community should check for the UID

0.11 is only looking for the pubkey. We should also check for the UID.

If the UID is present but with a different pubkey, we should raise an error. If the pubkey is present but with a different UID, we should raise an error too.

The problem should be explicitly explained.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information