I have a fan page with different photo albums. I’d like to add more pictures to each album by using the schedule feature of Facebook. How do I do this and make sure that the picture I schedule for a later post is saved in the correct album?
I don't think it's possible using Facebook. Facebook only allows you to schedule photos to the Page timeline / wall photos.
You will have to use a 3rd party app. A lot of them offer this functionality. I can recommend you Publer. Besides scheduling photo to existing albums, it also allows you to schedule new albums.
Disclaimer: I'm the founder of Publer.