The companion app works perfectly fine and there are no known issues with importing PDFs that I'm aware of with 4.0.6 or higher (4.0.7 is the latest). If the page order is incorrect, just left-click to use the page order UI to add missing pages, or right-click the page order field to just enter the page order to ensure all pages are used. If you are using one PDF per page, that is not advised and you would have to right-click the song grid and select "New Song" and then add all those PDFs on the files tab.
You cannot downgrade the companion app, so let's instead focus on fixing whatever isn't working for you, as I can get fixes implemented quickly if needed. Send the PDF to mike@zubersoft.com so I can test it out. Also, it would help to know if you have enabled Settings->Import Settings->Extract PDF Metadata on your tablet.
Mike
You cannot downgrade the companion app, so let's instead focus on fixing whatever isn't working for you, as I can get fixes implemented quickly if needed. Send the PDF to mike@zubersoft.com so I can test it out. Also, it would help to know if you have enabled Settings->Import Settings->Extract PDF Metadata on your tablet.
Mike