I have a couple of thousand of photos on Flickr nicely arranged into sets. I would assume the way I would normally want to use an app like this is create a gal

I have a couple of thousand of photos on Flickr nicely arranged into sets. I would assume the way I would normally want to use an app like this is create a gallery/set on FB/Flickr, and then click+drag it to the other site to have a copy. It looks like this UI only allows me to drag like 5 individual photos at a time, is that right? (Actually, it looks like galleries are recognised in facebook, but only individual shots from Flickr?)