Based on the provided description, it looks like the report is exported programmatically and the PDF file is returned to the client in browser e.g. How do I display a PDF directly in the browser without exporting first?
In such scenario the PDF file will be handled by the browser's PDF plugin, which is not in the scope of the reporting engine. Please check if the tested browsers support PDF previewing in browser, and if the returned response actually contains the PDF file or its bytes.
On a side note, our recommendation is to test the HTML5 Viewer
, that is designed for modern browsers and does not rely on IFRAME elements to display its content.
I hope this information is helpful.
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