Thanks for posting.
At this time, while video files will display as files with file names, they will not play in a Container field in FileMaker Go.
That said, it may be beneficial to fill out a FileMaker feature request which you can access here:
Feature requests are reviewed by the FileMaker Development team for consideration in future releases. While I could copy the issue into the Feature Request, there is specific information that only you will be able to answer.