Why did iCloud remove all my old photos from my phone after I synced them all to iCloud?
This should be simple. My iPhone got full of photos. I signed into iCloud and synced them all to iCloud (selecting the "optimize" option to keep lower resolution photos on my phone). After all this, the only photos that are on my phone are from the current year. All others are gone. Fortunately, they are still on iCloud (unless some other undocumented deletion is pending). What happened?
iPhone 6s