external storage user access restrictions on file deletion

[kavitha271]

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Is your feature request related to a problem? Please describe.
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yes , I was trying to restrict user access on files in external storage.
we want restrict users on deletion of files and only admin can delete files.
I was unable to find any settings related to external storage files access.

Describe the solution you'd like
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Please add more permissions on external storage for users/admin access.

Describe alternatives you've considered
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Additional context
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[q-wertz]

Maybe a workaround:

Create the same share two times, add the groups that are not allowed to delete to the second one and mark the share as Read only

[joshtrichards]

Related: #14436

[joshtrichards]

Set-up External Storage, then when you set-up the Sharing options for the mount folder, specify Custom permissions and toggle off the Delete option: https://docs.nextcloud.com/server/latest/user_manual/en/files/sharing.html#internal-shares-with-users-and-groups