Cannot download .pdf files from mail

[joyeetaroy]

I have htc desire 820 dual sim phone and am unable to download .pdf which are attached in mail and view them, it says download complete, file saved but when I go to open the file it says cannot open file, what do I do? I have downloaded acrobat reader and google reader but could not open file. Please help and thanks.

 

[B. Diddy]

Welcome to Android Central! Are you trying to open them from the Downloads app, or from the actual Download directory using a file manager app?