Brackets currently are not allowed to group conditions:
TYPO3 would interpret this combination correctly:
[backend.user.isLoggedIn && (backend.user.userId == 1 || backend.user.isAdmin)]
If the backend user is logged in and either he has the ID 1 or he is an admin user.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information
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