Re: I had a file saved to my acrobat.com account. I went to open it and got a message saying the file was empty and the size of the file is now 0kb. Please help

The 11.5.0.1 version in which the bug got fixed was posted on the Playstore on same day. Most likely this would have happened when you were still on the earlier build. The latest build available on the Playstore wouldn't have this issue anymore.