A Microsoft file hosting and synchronization service.
Hello,
Thank you for posting in this community. I understand that you used the OneDrive embed feature to embed files from a website, but the content appears too large when viewed on a mobile device.
OneDrive mainly provides such a function to generate embedded code. If you want to achieve the desired display effect, you need to modify the generated embedded code. As shown in the picture, we can change the width and height of the frame according to our needs.
Also, I found that if I change the width to 100%, I can set the adaptive page width.
Since web design issues are involved and different programming languages are used for different pages, if my answer does not meet your needs, I suggest you contact Microsoft Docs to get more information. There are more professional engineers who are familiar with programming can provide help.
Your understanding is highly appreciated! Hope you are keeping safe and well.
Olivia - MSFT | Microsoft Community Support Specialist