About album sets and albums

About album sets and albums that can be selected by creating a new album. Both are like folders, but they have different uses.

Album

You can save photos and videos.

You can actually check it as a folder by iTunes file sharing.

You can save the album.

For the expert version, you can save the album set in the album set as well.

Photos and videos cannot be saved directly.

It cannot be confirmed as a folder by iTunes file sharing. (Existence only on data)