I cannot save Lightroom pics from my IMAC, to my camera roll. My IMAC doesnt see the photoslibrary. Will only show Imac HD or CC/DVD options. I can save to MY PICTURES etc., but I want to put it straight onto my camera roll, so I can see it on my ipad and iphone......
Export them to your hard disk and then import them into Apple Photos from that hard disk.
Or, much better, have a look at Lightroom Mobile for your iPad and iPhone! Lightroom Classic can sync photos to Lightroom Mobile, and Lightroom Mobile is a free download. You can then even edit images on your iPad and the edits will sync back to Lightorom Classic. Technically Lightroom Classic does not sync the original image but a smart preview, but that is fine for your iPad and iPhone. And you do not have to buy more cloud space, because these smart previews do not count against your cloud space.
Conclusion: You have a much better option already. You just need to set it up.