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plain and simple Bluetooth between a phone and a PC doesn't matter if it's a budget phone or a flagship phone rarely works at least ever for me. Bluetooth on Windows 10 with the latest update is still pretty hokey. I save or send a file from a phone to Google drive and it syncs with the app on the desktop and then I can print it from there as far as printing from the phone I use a Google print which seems to work fairly well versus an app for the printer.
I haven't used that app before, but I've tried printing via Bluetooth and haven't been able to find a commonality with why it fails. You can always try sending it to other devices like phones to see if that works. I agree that using Google Drive is a much easier solution and syncs very quickly. You should give that a shot as workaround.