Getting error while opening PDF file in android mobile.

Hi, 

Previously I used to open any Pdf file in Adobe acrobat reader easily, 

But since last update I unable to open some files in Adobe acrobat reader, and it's Showing error " This file could not be accessed, check your internet connection or make filename shorter " 

Even I do have very good internet connection, and file name also very short then also I'm getting above mentioned error,

I have cleared Catches and even reinstalled app, but same issue I'm getting continues and unable to open any pdf documents now. 

I've attached documents for your reference,

Kindly provide feedback with solution. 

Thanks and regards,