Hi,
Yes, you are right. Template does not use the image gallery, but you can use template with gallery.
Gallery add the watermark. You can follow below video and see all
www.youtube.com/watch?v=84ny6eUKMSQ
No, your client can not upload the photos, then download them from the gallery (and they will download with a watermark) then upload the water marked images again into vehicle manager.
We offer use gallery and template together.
thanks
Taras