I am building a new moodle site - using Vimeo as the video host platform.

All works fine on browser (Chrome, Firefox, Safari) as well as using the Moodle App on Android. Moodle Dekstop on Windows work fine too.

Only problem is with iPad Moodle App:

video is showing up -  but sound is not working.

I am using

• iOS 14.2 (18B92)
• Moodle Mobile 3.9.4

Using the same video (.mp4) with Youtube as the video server platform works fine.

However, for data protection reasons as well as the need to run ad free, Youtube is no possible alternative.

Embedded code:

... for Youtube:
<iframe width="560" height="315" src="https://www.youtube.com/embed/SS4Xjs5fijQ" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe>

... for Vimeo:

<iframe width="560" height="315" src="https://player.vimeo.com/video/511515414" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen="" style="font-size: 1rem; font-weight: inherit;"></iframe>