Moved video files from my Huawei are not readable

Hi I copied video files directly from my Huawei from \GabHuawei\Internal storage\DCIM\Camera

these files appeared to be MP4s and I assumed I could just move them like I used to with my Samsung.

But these files are not readable on my Computer. The file sizes show as 42 Gig but the file size on disk shows as a few megs.

I am either trying to use these files or to recover the files on my Phone.

Its a Huawei P20.

Ive tried recovering using fonelab which then wanted me to root it.

I have tried to root it using Kingo root which is also failing-

Please help

thanks