Photos and MAC

Could you please describe more detailed what you are trying to do?

Are you trying to import photos into Photos and add them to an album? Or are you asking about adding already imported photos to an album?

• For already imported photos you can easily add photos to an existing album - just select some photos and drag the photos to the album in the sidebar. If you accidentally drag the photos into a folder instead of an album, Photos will create an additional album in the folder. This cannot be avoided, because we cannot add photos to folders. Folders are used to group the albums and can only hold subfolders and albums, but not photos. - only albums can hold photos, so Photos will create a new album in the folder, if we drag photos to a folder.

• When you import photos and select a set of folders for import and enable the checkmark "Keep Folder Organisation", Photos will unfortunately create an additional enclosing folder for the new import. This cannot be prevented. But you can drag the imported albums out of the folder to the folder where you want them to be.

Hi

You are adding photos to a folder, not to an album.

Folders can't hold pictures directly, they have to go into an album. So if you drag a photo to a folder it creates an album for it.

You therefore need to create an album inside the folder, and drag the photos to the album.

(Folders, can hold albums and subfolders, but not photos. Albums can hold only photos)

Just so we're all on the same page as Tony pointed out Folders can only hold other folders and albums. Photos can only be in albums:

Great you could get it work. Good luck for your Memorial Album project.