The USB drive is blank so partioning won't be necessay. There is a Photo Library on both computers.OK, you can copy the Photos Library file to the USB drive and then copy it to the Pictures folder on the MacBook Pro, as long as the file is less than 16 GB. I would probably partition (reformat) the USB drive using Disk Utility first if you don't have any files on it you need. Use Mac OS Extended (Journaled) and GUID Partition Map, so that the Photos Library won't be corrupted during the transfer.
Once it is copied, you should be able to simply open up Photos and use it, as long as they are at the same version, and there isn't already a Photos Library on the new MBP.
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Ok. Thank you. I'm curious why I wasn't able to transfer anything through File Sharing.I only suggested that, because Windows formatted flash drives sometimes don't support files that are larger than 4 GB. And, sometimes they see Apple Photos Library files as a single file package.
Since there is already a Photos Library on the new Mac, you have to rename it before you copy the old one, or it will ask if you want to replace it. Once the transfer is done, we can work on getting the photos combined.
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