2. Add Video Files
2.2 iTunes File Sharing
You can also transfer video files to Video Converter App via iTunes File Sharing.
Connect your iPhone, iPad or iPod to computer with USB cable.
Select your iOS device from iTunes.
Click the Apps tab and scroll down.
Under the File Sharing section, select "VideoConverterApp".
Drag and drop video files from your computer or click the Add... button to add local video files to the app.