Can't seem to find previously added photos

[Claire62]

Hi everyone, 

I added some photos that I wanted to edit. However, I can't seem to find them, and when I try to re-add them, it tells me they have already been added, and I can't re-add them.

Where can I find them?? They aren't under All photos > Recently added and I can't seem to find them anywhere else. 

I'm using Mac, Adobe Lightroom version 7.5 

[JohanElzenga]

If you already added those photos, then you can't add them again and should not want to add them again, because that would create duplicates. I can't tell you where they are, but you should be able to find them in All Photos. If these are somewhat older photos, then do remember that Lightroom might show them by capture date (so the date the photo was taken) right now.