Deleted files still take up space when 'open in VLC' is chosen. (iPad Air 2 on IOS 9.3.5, VLC 2.7.8)
If I send a file of any format to myself as an email attachment, or open a similar file on the web using the 'open in VLC' option, it will copy itself to VLC but take up twice the amount of space as it says it should. This became a critical issue after I started watching a downloaded TV series. Each 700 MB file takes up 1.4 GB of space. Then when I finish the empisode and delete it, there is an unexplained 700 MB still taking up space on my device. I now have ~400 MB left on my device. When I hooked up my device to iTunes and looked at the storage, I have ~80% of my space taken up by documents and data and an other section that are not there when I look at my manage storage in settings.
I can not delete the VLC app because I have years worth of music sill on it and VLC gives me no way to back that up.