Deleting a photo from library also removes it from folder
Why is it when I drag a photo from the library into a folder… I try to then delete it from library, but it also deletes it from the folder.
[Re-Titled by Moderator]
If you want to identify all of your photos in the Library that are not in any album, you can use the Photos File menu > New Smart Album and set the condition for the Smart Album to Album - is not - Any. Then as you add photos to Albums they will automatically disappear from that Smart Album (or you can drag photos directly from that Smart Album to a regular album).