mssql '5 (Access is denied.)' error during restoring database

Question

I want to restore a database from a file (Tasks → Restore → Database; after I select from device and select file) via SQL Server Management Studio.

After that, I get th

Answer 1

I found this, and it worked for me:

CREATE LOGIN BackupRestoreAdmin WITH PASSWORD='$tr0ngP@$$w0rd'
GO
CREATE USER BackupRestoreAdmin FOR LOGIN BackupRestoreAdmin
GO
EXEC sp_addsrvrolemember 'BackupRestoreAdmin', 'dbcreator'
GO
EXEC sp_addrolemember 'db_owner','BackupRestoreAdmin'
GO