How do I recover photo names?
When I drop my photos into their Events, I title (name) the photos. I start their names with a YYYY/DD/MM format (so they automatically sort by date). As I am dealing with a lot of old photos (scans, etc.), I do not want to use the date the photos were added to Photos, but want the pictures to sort according to their naming scheme. This worked GREAT in iPhoto, and I had thousands of photos named (and auto-sorted) in this way.
When I upgraded Photos, most photos in my Events lost their titles (though file names remained the same). Everything is out of order now, and the photo names are only accessible if I seek-out the file names for each one. Individually. Thousands of them.
To further complicate this, not all of the Events suffered this change - only some of them! A few of the Events still show the photo names as I had originally entered them (in iPhoto).
How do I recover the names/titles of the photos and make them display in Photos the way they did in iPhoto?
Thanks for your help.
iMac, OS X Yosemite (10.10.3)