MP4 file(s) not working as attachment ?

To my former topic I attached and linked a"mp4" file.

Since then I get a “unknown video service” message trying to access the topic ?!
$regs ray

Hi Ray,

We were wondering what is was ourselves. It looks like a bug in the support forum product (we licensed it from the company that makes that software). Could you please start a new topic so we continue working on the issue?