When I go to EF Center, the EF Status shows "Duplicate SSN/EIN".  I copied the original file to efile the amended return for Michigan.  Can I efile an amended return from the original file AND attach files?  When I tried to use the original file to send amended return I couldn't attach any files because the file was already efiled.  Could the copied file be the problem?  If so, what is the fix to amend and attach files?