Adobe Embed API is working perfect on pc but not on mobile.

I have been using Adobe Embed API on my website. It was working fine for quite some time but now it is working only on PC and showing "File preview not available " on the mobile.

I hope there is no issue with the API and code base, as it works fine on PC. 

Link - https://home.mednotes.in/subjects/sub-topics/pathology/1.1

Any help would be much appreciated.