iPhone Camera ProRAW Question

When you are using iCloud Photos (Library), all photos and videos you take with your iPhone or save to Photos will be uploaded to iCloud and stored there. But that does not meant they will automatically removed from the iPhone and replaced by smaller, optimised versions on the iPhone.

To save storage on the iPhone, enable "Optimize iPhone Storage" (as you already have done). Then Photos will remove some of the large original Raw files from your iPhone, when more free storage is needed. But iCloud Photos will not optimize all files needlessly, only when storage is required. The iPhone will try to keep the recent downloads on the iPhone, to the same files will not need downloading again and again, if there is sufficient free storage on the iPhone.as long s you are using "Optimize iPhone Storage" it should not be necessary to worry about free storage, because the iPhone will try to free storage, if need be, fully automatically. Just do not fill your cloud storage with files you do not need. Manage your cloud storage, and iCloud will manage the storage on your devices.

When I had the opportunity to test the Apple Pro Raw images at the App Store, I have been very impressed with the quality. My next iPhone will definitely be one hat supports Pro RAW. It is worth the increased file size.