iPad storage is full, but deleting stuff isn't making free space. It's still full.
About 4 days ago I got a message that my iPad storage was full. 254gb out of 256gb is used. So I went to manage storage and deleted a whole bunch of videos. The message didn't go away. I went into Photos, and saw those videos were still there (But not there in "manage storage," which is weird. So I deleted them in photos. The full storage notice went away for about 10 minutes, then came on again. So I deleted more recommended stuff. Still 254gb full. So I deleted more today. Still didn't budge. It seems that no matter how much I delete, it doesn't go down. Or, if it does go down, ten minutes later it's back to where it was at 254. It's frustrating. My screen flickers, everything is slow, and my background image is all black.
Separate but I'm sure it's related: What's weird is that up until about a week ago, I probably had 50gb of videos downloaded to my iPad from my dropbox account, (and my ipad still wasn't full), but now all those videos show as not downloaded, yet it is full now. I'm not sure what to do. I suspect part of my problem is there's maybe an issue with dropbox stuff saying it's not downloaded to my iPad but it is. Is there a way for me to see if that's the case?
Even with the dropbox issue, my storage should be freeing up with my deleting of stuff, but it's not. Does anyone now why? And more importantly, what I can do about it?
EDIT: I see my system data is at 121.08gb. This can't be right. The description says system data includes caches, logs and other resources. Something seems wrong with this. Half my storage can't be system data. I would think if there's this much stuff in a cache or something, it would show up under "suggestions to free up space" screen.
Thank you in advance for any help.
iPad Air