If you have upgraded to macOS Ventura (13.x) and facing a connectivity issue with your Android device through the Android File Transfer app, then read on.
Android File Transfer Not Working on macOS Ventura
Unable to Send Files from Mobile to Mac using Bluetooth
You have turned on Bluetooth on your mobile and on your Mac as well. You have discovered and successfully paired the devices. Still, you cannot send files from your mobile to Mac. File transfer fails.