Internal storage is almost full, but it's not

[Android Central Question]

I'm on a Moto G4, everything is up to date.
Recently my phone has been constantly warning me that my internal storage is almost full, and that 'some functions may not work'. Under device storage, the internal shared storage shows 9.52 / 10.82 GB, but all subheadings (apps/video/cached data...) total to only around 2 GB. Something is taking up 70% of my internal storage, but I can't find it, so I can't delete it.

Any idea what's going on/how to fix this?

 

[B. Diddy]

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