No thumbnail/file preview support?

[JuhaszBalint2]

Describe the bug
I've implemented the OneDrive File Picker V8 SDK in my Google App Script project, which, at this point in time, is just a web app that launches the Picker. I have noticed that the video, image, document files have no thumbnails/file previews, ie I can only see a file icon, but not the content of the file so I have no idea what file is what. I will show a screenshot. https://imgur.com/a/52hKAYa

To Reproduce
Implement the Picker in a Google App Script web app keeping in mind the Google App Script limitations.

Expected behavior
The Picker should display thumbnails/file previews for video, image, document files so the user will know what file is what.
Screenshots
https://imgur.com/a/52hKAYa

Details
I've implemented the OneDrive File Picker V8 SDK in my Google App Script project, which, at this point in time, is just a web app that launches the Picker. I have noticed that the video, image, document files have no thumbnails/file previews, ie I can only see a file icon, but not the content of the file so I have no idea what file is what. I will show a screenshot. https://imgur.com/a/52hKAYa

Additional context
Google App Script has certain limitations, so in this case, I had to serve the Picker nested in iFrames. Other than that, it works perfectly. If necessary, I will share the metadata of a given file selected by the Picker. If required, please tell me, and I will share those details.

[JuhaszBalint2]

Additionally, I remember one of the devs said to somebody else who had opened another issue pertaining to problems with their company's Sharepoint sites when using the Picker SDK v8, that supposedly v8 doesn't use MS Graph API. Perhaps this issue arises from that fact? I've implemented another version of a "OneDrive Picker" - albeit not this "official" SDK - using the MS Graph API, in that version the file previews work perfectly. So I'm curious whether in V8 it's possible at all to have the Picker display the thumbnails / file previews for files?