Issue opening PDF files in Mobile devices_SharePoint 2013

Hi,

I have a SP 2013 on premise environment connected to an Office web app server.

By default all my Office and PDF documents are opening in WOPI on browser.

The Office documents are working fine on mobile devices. I have a problem with opening PDF documents in mobile where i am seeing below error.

"Viewing .PDF files has been disabled in Microsoft Word Mobile viewer."

I have tried both enable and disable: New-SPWOPIBinding –ServerName "Server.corp.Contoso.com" -Action "MobileView" –Application "WordPDF" -AllowHTTP

But no luck, then after i removed the wordpdf binding to view the pdf files default. then its works fine for both browser and mobile( concern is that PDF files are downloading to device and opening)

Now my concern is that users shared the WOPI framed URL's in the mails, that links are not working(in mobile as well in browsers) getting "sorry something went wrong".

Can any one help me how to resolve this issue.

Note:As per MS article that office web app server is not supporting mobile view for PDF files .