Do my members need a WordPress login to upload?
They need an account on your site, which is the point: the photos belong to your community rather than to a platform. They never see wp-admin, though. Uploading, albums and privacy all happen on the front end.
Is this a gallery plugin?
It produces galleries. The difference from a classic gallery plugin is who fills them: you place a grid filtered by tag, and your members keep it stocked. If nobody but you will ever upload, a simpler gallery plugin will serve you better.
Does it need BuddyPress?
No. It runs standalone with its own member library and profiles. BuddyPress is an integration rather than a requirement, and if you run BuddyNext it hands the interface over rather than competing with it.
What does the free version actually include?
Uploads, albums, per-item privacy, the tag-filtered grid block, the moderation queue and the BuddyPress integration. It is a working media community, not a trial. The four named feed layouts are Pro, as are cloud storage, per-member quotas and photo competitions.
Can I move an existing library in?
Yes, if it is in rtMedia, MediaPress or BuddyBoss Media. Pro ships a WP-CLI importer for each that keeps original upload dates and author attribution, so a migrated library does not look like you posted everything yesterday.