files_external: UI issues around Local storage backend and personal external storages #57917
Description
Please see the screen recording, but it an nutshell:
- Go to admin settings → external storages
- Allow some external storage types to be allowed, including Local
- Switch to personal settings
- Add an external storage and select a Local one, add the details
- Confirm the password dialog
- See it failing
Things to solve:
=> Local storages are not allowed for users for a good reason, it should not be offered in the first place
=> A user should only see external storage classes that are allowed to be added
=> Password confirmation should not repeat every time, when there was a recent run?
=> When it fails, it appears the password is wrong, but not the actual issue
=> All settings are lost when giving up and you'd have to start from scratch, e.g. when there was just a typo in the settings
=> To touble check: I am not convinced adding a storage is allowed at all. Quick tests for me always ended with a 403 response.