I can not upload videos ? can you help me


I prepared to video according to the required specifications .but
does not turn on the installation page video preview,thumbnail,preview image boxes etc.

I can not install these boxes.

I can only make installation of the Choose File.



You upload all your files first, and then you can select those files from the dropdown menu. So use the choose file button to upload your main file, preview, thumb, preview video, and then they should be populated in the drop downs.