HTML5 Media Player

Hi guys, anyone using the above.
I have an issue when playing back on an iPhone 6, it just wont play.
It will play an MP4 on a laptop, and a Samsung S8, but not the iPhone 6.
Same issue with WebM files. The Ogg files will play on a laptop, but not on the Samsung or iPhone.
Any help appreciated.

I’ll be in touch shortly to assist, thank you for reaching out.