My Soundcore Boost A3145 has TWS instead of AUX. How do I use AUX ???
A quick search is implying you can’t.
But let’s try?
What happens when you connect USB-C cable to laptop or phone? It comes up as audio device? This is unlikely to work as it’s devices drivers etc.
Do you have any of those USB-C to Aux dongles like you get with some of the newer phones? This is also unlikely to work as the speaker is unlikely a host.