Box For Salesforce - User Guide

Hello all,
Hope someone has some clue about issue that has been troubling me..

For some documents I get thumbnail representation via API with no problems, pdf files included.
But, as well, for a lot of them, I just can't get thumbnail representations of regular pdf documents we upload. Representations.entry object is empty completely, even though document is available for preview and download.
This is very troubling as we can rely on API to provide all necessary info that documentation states it does.
What can be the issue with this?
Thanks in advance.

Luka

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