10GB is very large for any app.
But, I see a few others that seem large as well..
Facebook Messenger is using half a GB, as well as a bunch more I am guessing.
Social media apps and Google apps are notorious space hogs.
Personally, my guess is that there may be a ton of thumbnails stored on your device.
These are tiny, low resolution copies of existing pics and videos that you see when searching through your gallery, file manager, and other apps.
The problem with them is that multiple apps will make multiple thumbnails of the same thing, and they are more difficult to find to be rid of them.
Not to mention that the next time you open whatever app that makes them, they will just reappear again.
The thing is, a good app won't even need to use or make them, or store them.
I do not regularly recommend cleaning apps, but there are two that I do (and use myself) for multiple reasons.
The one to try first is an older version that has no ads.
https://systweak-android-cleaner.en.uptodown.com/android/download/1633705
Once it is installed and the permissions granted, check out the Duplicates section first.
This will scan the device and SD card for copies of files, and tell you where they are.
If there are only a few here, then great!
If there are a lot, don't delete them yet.
Go back to the menu screen, and select Junk Files.
It may take a minute or two, but this will find, sort, and show the location of files on the device that are generally trash, like thumbnails.
Notice that there are checkmarks, denoting what is to be deleted.
You may uncheck, or tap the item to open it.
Once opened, you may uncheck or check individual files.
You can also tap individual files to see them.
Sometimes I get errors doing this, because some files are not able to be read by my default media app.
Once you make your selections, go back and select Clean Now.
You will be asked to verify.
If thumbnails are a large issue (notice how I have almost 1GB of these stupid things!), then there are ways to be rid of them.
But first, try this app to see if we can locate a large amount of files somewhere and pinpoint the location.