Answered
Delete question
When I want to delete a photograph from Lightroom I don't want it to necessarily delete in my iCloud, but I just want it gone from Lightroom. How do I do that?
In Lightroom, the Device shows your camera roll and iCloud photos. Deleting images in Lightroom's device tab is deleting it from Apple's system.
In the Edit tab (that free Lightroom users see), or in the Lightroom tab (that paid Lightroom users see), deleting images removes them only from Lightroom+Lightroom's cloud storage, but not from your camera roll or iCloud.
Does this answer your question? If you are still unsure, I recommend you make a full backup of your device, and then try removing a single, unimportant image. Then see if that has the expected results.
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