I think your problem is that the mime type is not set on the second document, so WebLink is not able to pass that information on to the browser.  You want the mime types of your pdfs to be "application/pdf".

Thanks for your respond.

We have the above issue last week onwards. we did not face such an issue before.

We are using IFRAME to display such a dynamic documents (PDF / MS Word)  received from Laserfiche document.

& don't have mime type setting in IFRAME Properties. please suggest.

  var elmIfr = document.createElement("IFRAME");
                elmIfr.src =DocUrl;//DocUrl;
                console.log('iFrame DocUrl=>'+DocUrl);
                console.log('iFrame elmIfr.src=>'+elmIfr.src);
                elmIfr.style.width= "100%";
                elmIfr.style.height= "750px";
                removeChild();
                document.getElementById('PreviewDiv').appendChild(elmIfr);

The mime type is a property of the document within Laserfiche, and it seems to be missing for the document.  This is normally set on import, so I can't guess what went wrong without knowing how these documents are created.

Dear,

Those documents are imported to laserfiche through workflow using SDK Script.

Please let us know how we can add this mime type to the document while importing.

DocumentInfo has a MimeType property.

What about the old documents? How we can assign this mime type to all documents in order to be able to open them in the ifram