Photostream not updating on Mac Photos

Anybody else having issue with Photostream? I had two iPhoto libraries: One I was actively using, and one I've been hanging onto to merge one day. When I updated to Photos app, I read the pages on opening multiple libraries, hoping that this was finally my opportunity to merge the two. Alas, this only allowed me to successfully open each library, one at a time. When it became clear that there was going to be no way to merge the two libraries within Photo, I decided to just go back to opening my default iPhoto library with Photos and would import from the old iPhoto library manually some day in the future. My question/problem (finally, I know): It doesn't appear that new photos from my devices, since configuring Photos on Mac, are showing up in my Mac Photos photo stream. They stop on the day I installed it, and I don't see any way to force a sync. What did I do wrong? What am I missing?