I type in the URL shown in the VLC app on my computer and drag and drop files to it, when I am connected to same network of course.
https://www.videolan.org/vlc/download-ios.html
> A media library, with WiFi Uploads & Downloads, Dropbox, Google Drive, iCloud Drive, OneDrive & Box.com integration and optional passcode lock.
>Web Interface for easy uploads and downloads to/from device.