When I use Open URL on an iPad with FMGo 14 the video plays but no audio plays.
To test audio levels click on the open with Safari button bottom left and video and audio work fine.
There does not seem to be anyway to use app url to launch directly into Safari or Youtube app
ie youtube://address for instance.
See Play YouTube URL database below.
This works fine on Filemaker Pro Advanced as it launches it directly in Safari.
Any work arounds are most welcome.