[Zubersoft]

Can you try connecting both your devices to a phone acting as a WiFi hotspot? If that works and you can then drag & drop your PDFs without issue into the companion app, then there is a legitimate connection issue due to the router. If you encounter the same problem, then it's something with the library. In that case, I'll need you to go to Settings->Backup and Restore->Backup Library, create a .msb file and share that mike@zubersoft.com. I can then test this out myself.

Mike