Eventually? I'm not quite sure what you're asking. I was just asking if that would work. Ultimately, I want to have an album which only members in a certain group, can upload to, but which won't be seen on the site (except by me or mods) until I (admin or mods) approve them. And after they're approved, everyone can see them.
Part of my site's content is member-contributed Inkscape (vector graphics editor, i.e. SVG images) tutorials. Members can either use an SMF mod called SMF Articles, which allows members to create text tutorials; or if they make video tutorials, they can be uploaded into an album which will hold only video (and possibly PDF, SVG or PNG) tutorials. I want to review tutorials before they go public. SMF Articles can be set so that they don't go public until admin (I) approves them. But I can't think of any way to see video tutorials before they go public. Being able to approve the images in the Tutorials album (which are really videos, rather than single still images) would allow me to do that.
I was thinking if I make an album (public album, not user album) that only I can see, but still allow visitors (member groups that are allowed to upload to public albums) to upload, that might work. Then after I review the video, if I approve it, I can just move it to the Tutorials album. Not exactly the same thing as approval by album/category, but I'm asking if that would work, until approval by album/category is available.
Because I'm still kind of fuzzy about "Permissions for this album" settings in Album Properties. Not sure if I understand correctly.