(Windows) Sometimes photos get "stuck" on the iPhone, and the usual method of right-clicking on the iPhone in My Computer and importing doesn't work. It errors: "No new pictures or videos were found on this device".
The fix is to rename the file C:\Users\[username]\AppData\Local\Microsoft\Photo Acquisition\PreviouslyAcquired.db
NOTE: AppData will probably be hidden - you must make hidden files and folders visible in Windows Explorer options.
(source)
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