In one of my boards, I have some PDF files as attachments. When I open them on the desktop app, the preview of the PDF opens and I can read it’s content, which is OK. But, if I try to do the same on the mobile app, I just got a white screen (as showed on the screenshot attached).
Hey there @joao.jesus 
You are absolutely correct, I’ve tested this on my end (huawei p20lite) as well and it seems like we have a small glitch when it comes to our PDF attachments.
The only solution for now would be to simply download the attachment and open it via phone. 
I’ve turned this into a ticket and we’ll see how soon this can be added to our devs to do list!
Thank you for reporting it, we really appreciate it 
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