"Last import": no replacement for this?

Question

A friend emailed 15 photos that I exported to Photos. Problem: I can't find the photos, because they're probably scattered by date among my 20K+ photos. With iPhoto, I'd simply choose "Last Import" and then file then photos to albums, etc.  Now I can't even FIND them, much less add them to a slide show for presentation this week.
As with many users, I'm shaking my head and saying, "Seriously? Apple didn't think about this enough to present an obviously solution?"

Answer 1

halpa wrote:
Several points of learning from this discussion - have appreciated everyone's input:
problem:  Apple changed to Photos from iPhoto, but Mail's options for handling attached photos are still "save" and "export to iPhoto" (inconsistency)
if you do "export to iPhoto," it doesn't show up as Import (or in Last Import" in Photos)
I had to "Save" the email-attached photos to a separate folder on my Mac, then import them into Photos (then they show up on Last Import too)
very helpful:  with the sidebar open in Photos, I realized you can scroll down to Albums and find under that a folder called "iPhoto Events" that helps keep you sane after migrating from iPhotos
Are you using the native Mail.app? Then you should be able to "export to Photos".  I am seeing three export options in Mail, when I ctrl-click an attached photo:
Did you enable your current Photos library as the System Photos Library? Check the Preferences > General in Photos, while you are browsing your library. If "Use as System Photos Library" is grayed out, your settings are correct.  Then try, if quitting Photos and restarting the  Mac will help.
"if you do "export to iPhoto," it doesn't show up as Import (or in Last Import" in Photos)" -that is right, because you are saving to your iPhoto Library and not the Photos library.  You should be seeing the saved photos, when you launch iPhoto.
"very helpful:  with the sidebar open in Photos, ... "  I keep the sidebar open at all times. That makes it easy to drag and drop to albums and projects.