Filenames in Aperture not migrating to Photos
My Aperture filenames don't appear in Photos. Over the years, in Aperture I gave file names (actually Version Name to use Aperture lingo) to each photo through a Batch Change in Aperture where I gave it a Custom Name with Counter and I checked the "Modify Original Files" box in the Batch Change dialog box. After migrating my library to Photos, these filenames don't appear in Photos (yes, I checked Title in View>Metadata menu in Photos). To test this, I created a new small Aperture Library and used Batch Change to rename the images as before, except this time, I did not check the "Modify Original Files" box. I then migrated that new small Aperture Library to Photos and guess what, the file names did appear in Photos. Somehow, the act of clicking "Modify Original Files" causes the Version Name to not transfer to Photos, which seems counter intuitive to me. I've got 80,000 photos and don't want to rename them all. Is there something with Metadata Presets or some other technique in Aperture that I could do to cause the file names that currently exist in Aperture to be recognized in Photos?
MacBook Pro (15-inch Mid 2012), OS X Mountain Lion (10.8)