(I reviewed the comments from this post, but I was not able to resolve my issue).
I am trying to attach a mdf file that I placed in other drive, and I got this error:
I am aware of the permission issue of the folder that I am pointing the file (to attach).
I gave the full control on that folder for both myself and SQL Server account (NT Service\MSSQL$TEST1).
I am not sure this extra screenshot would help:
What can I do to fix this?