I am having the same problem. Very frustrated. Switched over to Photos from iPhoto, now I either have great difficulty uploading photos to Flickr or it doesn't work at all. At first I found that if I tried to upload more than a certain number, the Flickr option would not appear in the menu. Then I found that I couldn't specify an album to put them in, so then had to go in and manually try to sort the photos (from very tiny on screen images) into a new album. And worst of all, when I tried yesterday to upload a number of photos, I got the message that said they were exporting, then nothing else happened, and then those photos simply DISAPPEARED from Photos!! They didn't go to Flickr and I have no idea what happened to them! Does anyone have a fix or a suggestion for a better photo service that actually works with Photos??