The most viewed file did not appear in site usage page.

Hi Everyone!

I have replied on the following amazing blog.

https://techcommunity.microsoft.com/t5/SharePoint-Blog/Establishing-a-new-Site-usage-page-in-SharePoint-Online/ba-p/83870

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Mark-KashmanI have a pdf file in the document library and this pdf file is accessed frequently by plenty of users.But I can not see the pdf file in the Trending view. Is there a timer job  when user access the pdf file. Or this is only worked in office file not for pdf

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But I want to write my question here in detail.

I have upload a pdf file to the site document library.

Then I accessed the file many times with another user.
Accessed time: 11/20/2017 5:33 PM
But this 333.pdf do not appear in the Site usage page.

I have seen many office files appeared on my another site collection.
I want to know if there is a time job on this site usage feature.
If there is a time job on it and  when the pdf file will show in the Trending view.

I am testing this problem and waiting the pdf file appear.
During this time if anyone can tell me the answer I will be very happy!

Thanks!

Tobey