I get this pop up every now and then when opening Photos, and get to choose to optimize storage on iPhone by keeping optimized photos on my iPhone and full resolution in the cloud. Even though a have 39GB free space on my 256GB iPhone X. That doesn’t seem right? Solution?
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Then turn off the "Optimize iPhone Storage" option on your device. See the "Store your photos and videos in iCloud" section in:
User profile for user: Saltakatten
Question: “Storage almost full”-pop up despite lots of space