I just got my first PRO camera and playing with ProRAW - which produces extremely large files. I also use iCloud Photo Library. Are the original ProRAW files (or the 48MP HEIF files which are more reasonable in size) kept on the iPhone or are the original files sent to my iCloud Library and only smaller versions kept on the iPhone itself until I want to edit one of them? I do have the setting "Optimize iPhone Storage" turned on but I have read differing answers of when the system will upload the original large files - one person said only when the iPhone runs low on storage and the other said it does it all the time. Thanks.