I have no more space on my internal storage and I cant figure out what's using all the space

[Android Central Question]

Huawei Y5 prime 2018.
I bought memory card and moved there all the pictures and videos.
I go to the storage maneger and it shows that all the movies, apps, pictures etc. Together is 2.5 GB.
And then there is:
"other apps 7.1 GB"
"system 5.4 GB"

I tried to stroll around the files with the computer and with the phone and couldn't find in the internal storage nothing unusual. All the files that shown weigh a lot less.
The phone bearly work now... Almost every app crashing down after a little use.
Save meeee

 

[B. Diddy]

Welcome to Android Central! Try DiskUsage to give you a better idea of what's taking up your storage: https://play.google.com/store/apps/details?id=com.google.android.diskusage&hl=en_US