Search:

There is a temporary solution:

Go to: templates/your_template_name/controllers/add_listing/step.photo.tpl

Find:
var video_file_types = 'mp4|flv';
Replace with:
var video_file_types = ' ';...

As i know, the mentioned code is no longer using in flynax script.
It seems there is no way with current version 4.7 and you need customization by flynax team.