Sorry…no photo showing up. I’m now sure how flickr works, so I don’t know how to help you. Someone will be along that may know how flickr and CTT works together.
I have a flickr account. I open a second tab with flickr in one tab and CTT in the other, then went to my groups, selected the group I wanted, put cursor over the thumbnail pic I wanted, left click to show it large, then right click and coppy the larger viewed pic, then back to this tab and paste.