Yep, 2MB seems to be the breaking limit, which is also the limit of uploading docs to Drive, whether or not that’s coincidental: https://www.case.edu/its/training/materials/googleapps/GA_DOC_GoogleDriveUsagePolicy.pdf
This change by Google is a huge kick in the balls for me as it’s just ruined the purpose of our businesses website! I knew such a simple and effective way of displaying PDF’s was too good to be true.
And I can’t seem to find any news or help about this change by Google at all!
An alternative plug-in is PDF Light Viewer Plug-in, but it requires you to get your web host to install ImageMagick the server OS, and Imagick for PHP, which is also a pain in the ass.
Cheers for your help though guys.