Hi anticbook,
Good day,
Are your firmware version currently on the latest WW-16.0610.1901.74, camera app on version 4.2.7.0?
If yes. Please kindly restore the camera app for a check. ( settings > apps & notifications > see all apps> camera > storage & memory >clear data and cache.)
If this problem still appears, please show me this error screenshot and kindly tell me which place do you save videos?
Thank you.