I recommend that you test this for yourself before you go on your travels.
That said, when you return home the newly taken photos will appear in a folder on your Mac - in my case in a folder called John's iPad. I think this is best treated as a temporary location, so in LrDesktop I drag photos into my permanent storage folders. At that point I manually remove them from the camera roll.
That's the overall picture, but then I think you need to distinguish between different categories of photos:
- iPad-taken photos - LrMobile syncs the newly-taken originals to Adobe's cloud, while keeping smart previews on the device. So no clean up needed.
- iPhone-taken photos. I suspect it would be better to get LrM on the iPhone too and add new photos from the camera roll. Apart from convenience, it means iPhone-taken originals go up to Adobe's cloud and then down to your Mac. I am not sure (my phone isn't smart) what would happen if you used iCloud sync to get iPhone photos down to your iPad and then up to LrM. My fear is that iCloud would sync lower res copies down to the iPad, while the iPhone-taken originals would then be elsewhere on Apple's iCloud/Photostream or whatever they now call it.
- Canon-taken originals. Remember LrM will only be able to import JPEGs, so maybe shoot Raw + JPEG? But once you do get JPEGs into LrM via camera roll, these JPEG originals will sync to Adobe's cloud and then down to your Mac.
But test before you depart on your trip. Your questions are on the right track and no long-winded answer can be as good as seeing what happens with your own eyes.
Thank you so much. Testing this beforehand was a practical and excellent suggestion. After finding out that I could not import Raw photos to LR Mobile, that negated the use of LR Mobile for the pictures I wanted to take. So I decided to do something else. But I did use LR for the iPhone photos. Then when I import the RAW photos, I will import them to the same collection to get all the pictures together. That in itself will help tremendously to organize all the photos.
Thank you again.