I have 41,000 photos on my iMac Photos library. I have an iPhone 6s and iPad Air (wifi only). Most photos are transferred when traveling to my iPad which then transmits them to Photostream when I have wifi access, usually in a hotel room. When I get home they are transferred via Photostream to my iMac. I edit photos on my iPad and create albums on my iPad, both while traveling. I would like the edited photos and albums to be transferred to my iMac Photos library which is my primary repository. This does not happen now, but I understand that it would work if I sign up for iCloud Photo Library. Is this correct? I hesitate to sign up for it because of the expense but am coming around to thinking it is the most convenient option. I use time machine to back up the photos and Flickr Uploader (which will now cost money). If I sign up for iCloud Photo Library I assume my photos are accessible only when I have cell service with my iPhone or in the case of my iPad, when I have wifi. I want certain albums available on my iOS devices all of the time. I currently sync them from the iMac using iTunes. Would I still do this if I was using iCloud Photo Library or is there another way? When I get home from a trip I want to delete many of the photos from my iPad to clear up space. If I use iCloud Photo Library can I delete them from my iPad camera roll after they are on the iMac Photos library without them being deleted everywhere? Thanks for any advice!