Embedded Camtasia video stopping Storyline MP4 playback on Wistia.

So... having an issue that I've never had before between Camtasia, Storyline 360, and Wistia. Hoping someone else has had this issue.

I create a video in Camtasia as I normally would and export it as an MP4. For the sake of argument, let's assume the video is 6 seconds long.

I then create an Articulate Storyline 360 file that is 3 minutes 22 seconds long and place the 6 sec Camtasia video midway within the Articulate Storyline file.

I then export the entire Storyline 360 file as an MP4 (so the Camtasia mp4 is within the Storyline mp4.) The video indicates the length of 3 minutes 22 seconds as it should (with the 6 second camtasia video nested within it.)

I open the Storyline MP4 and it runs perfect on my PC for 3 minutes, 22 seconds.

I upload the Storyline mp4 to Wistia and it starts to play ... the entire video in Wistia stops at exactly 6 seconds. ... Has anyone else run across this before?

Video result can be seen here:
https://calabrio.wistia.com/medias/qosqwlbmdf