PDF fo;es

I recently upgraded to a Galaxy S7 edge...love the phone.... from an S5. The problem I am having it with downloaded pdf files from the browser.  On my old S5, the file would be downloaded and viewable from My Files, Download history. Now with the new S7 it downloads and is viewable from the taskbar and notifications, but after you close it and go to My files, download history, it is there , but says "Not Supported" and will not open.  I have tried Adobe PDF Viewer and Google PDF viewer and neither work.

Is there a better PDF viewer or a setting for the download that will help this problem.

BTW the PDF is from a local grocery store and always worked on the S5, so it is not the file. It will not open on the S7.