Video clips not playing

My mp4 video clips situated externally on the phone and activated from a .docx file display but will not play in app.
It starts to go but stops in about 3 seconds:
Any ideas?

@Ron if you want me to look at your app, then send me a private message with details of where I can get the project from DropBox or Google Drive.

To send a private message, in the web interface, click on my icon and choose Message.

Hi Thanks for this reply. I will do that asap.