I used the OnePlus tool to transfer from a previous phone.Is it a clean install or you copied files from previous phone ?
It could be you're recent deleted files in gallery app at the bottom maybe try to "clean"
You can install Google Files Go from the playstore to easily manage you're storage
Im no Math genius. in the first screenshot all that storage equals to 193Gb. Media storage is considered either part of photos & videos or Other apps. In the second screenshot it looks Media Storage is part of user apps. User data maybe for system apps not listed???It appears to be in addition to all those though. See screens.