Kokoro Text to Speech Container Not Generating Speech (Fomat Issue?)

I followed the instructions from Marius Hosting after installing Portainer, to install Kokoro Text to Speech container on my NAS. (https://mariushosting.com/how-to-install-kokoro-on-your-synology-nas/) Tried to generate speech and I get a “MediaSource.addSourceBuffer:” error message per attached screenshot. I checked my NAS’ Container Manager and it says both Portainer and Kokoro are healthy and up (running). Does anyone know how to get the text input to work? Currently trying http connection before I go through trying to set up https. I’ve tried search after search and cannot find any resources that offer understandable troubleshooting solutions.