a) My guess is, it might a problem with the drivers. I installed some LG programes earlier, already deinstalled it... But, Maybe you know better how to renew the Android drivers on the Mac and get rid off the stuff which probably blocks me from having the file transfer function again.
b) do you know at least any other (free) Programe that uses ADB to connect the phone to Mac?
c) something I have not thought of... You tell me
Once it was possible to connect the phone to my Mac and transfer files with Android File Transfer. Now it is not. I tried several other programmes, none can connect to the phone via MTP (for file transfer).
When I chose not "data transfer" but "photo transfer" as an option in the phone, the Photo app on Mac opens and I could trnasfer photos - so it works!
But I need file transfer....
I have and try several cables. Phone works without any problems with windows.
The only thing works now for transfering files via cable is MacDroid, which can connect the phone via ADB insetad of MTP. --> Problem: it costs money (and why should it now work in MTP in the first place).
The phone generally is found by the computer:
I use as OS "El Capitan". On the phone Android 9.0. Phone LG G6
PS: The phone even asks me if I want the Mac to authorize:
PS2: Macdroid works with the phone even in MTP Mode when Debugging is deactivated. So what is this... I do not get it.