I installed bluetooth and it seems to work. I paired with my smartphone. Sending files working fine. But when i receive a file i get a message in the upper right corner that there is a file incoming but see no possibility to approve the receival. Do i miss something?
Hopefully someone else will be able to help you on the bluetooth problem.
In my opinion bluetooth sucks so I disable it on all my laptops. I would advise you to connect your phone trough a USB cable.. your download would be a bit faster and you can charge your phone at the same time. Truth be told my Samsung S7 and S9 phones suck badly at transferring pictures to the computer (reading lots of images takes an enormous time) so I use a card reader but for most others phones it should be ok.
I have also problems with receiving files over Bluetooth from my phone. I use now the android app Wifi file transfer, which allow you upload and download files over a wireless connection. No USB cable needed. Works perfect.