Iphone bug report

System data was taking too much memory.
I updated it to 15.5.
Put it to work and DID NOT restore backup.
Lots of free memory now.
BUG : I filmed 15 minutes of 40k 30 fps movie. Lots of memory was consumed of course.
Deleted the video file and removed from recent deleted flies.
Memory kept full.
Needed to do a full reset on my iPhone.