My Mac can see and send files to other devices on AirDrop, but the other devices can't see my Mac
When using AirDrop on my iMac running macOS Catalina, I can see and send files to my other devices (iPhones and iPad), but my other devices can't see the Mac, even when I have set AirDrop on the Mac to be discovered by Everyone.
I have also tried turning Bluetooth on and off, but it seems to not even really work, as it stays "Bluetooth: On" and "Now discoverable as" even after clicking Turn Bluetooth Off.
I have read some advice online about going to System Preferences and Security and Privacy, and turning Firewall Off, but I am unsure about this, and feel that this shouldn't be needed?
Edit: I actually just realised my Firewall is in fact turned off.
I cannot find any help online with my specific problem, any help is appreciated.