Thank you, FoxFifth--I get now you meant cache, and thank you for your help. I see now that every one (!) of my pics is downloaded so I am seeing ghosts versus current data. I've also learned that I can take pic A with iphone and pic B with ipad and not see A on ipad's google photos (tho it appears in the iphone's first) and not see B on the iphone's. This is after exiting the google photo app each time and after having wifi turned on for the ipad. So the timing of the syncing is just a mystery for me. Since I intend to take no more pics with ipad, however--was only experimenting--this shd be no issue.