If you've purchased extra iCloud storage space, have you enabled iCloud Photos so that your photos will be stored in iCloud?
Also, consider using the 'Optimize Phone Storage' feature to conserve space on the device.
If you've purchased extra iCloud storage space, have you enabled iCloud Photos so that your photos will be stored in iCloud?
Also, consider using the 'Optimize Phone Storage' feature to conserve space on the device.
If you synced the photos using iTunes, you must have the photos on a computer. Is the computer syncing photos using iCloud? If so, the photos should be in iCloud.
iCloud backup