Can I upload many photos at once?

Yes, you can do it by choosing several photos, or a whole folder, in a tour's upload window or in the Add Panorama window of the Asset Library. They are checked first and shown as a list of what will be added, what will be fixed and what cannot be used; nothing starts until you confirm. Your computer then makes up to three at a time, fewer when they are large, and the other rows wait their turn. There is no fixed number per upload: what counts is the room left on your plan, which the upload panel shows (How many photos you can add).

To use the same photos in several tours, add them once and then, in each tour, click Add panoramas and import them from the Asset Library tab: they are not uploaded again.