Oh, that’s an easy one – no need to disturb Jacob on this; A definitive Yes is the answer.
E.g. I’ve just added the 6188th image to one of my sites running WPPA+ without a problem. Pretty sure there’s folks out there who have > 10 times that number.
I can’t actually see any practical limit, other than server and database space, guess there isn’t an actual one (?)
However be warned that it becomes increasingly difficult to handle their order if you’re putting that many images into a single _album_. That said I done it with >1300 images, but you need a lot of screen space and an excellent memory (/brain) to re-order such large collections.
