I am trying to connect a Google Pixel 4a to a Ubuntu desktop via USB to transfer files in Music and Photos. I am not using the lead supplied by Google because it is usb c male to male, but a usb charge lead that came with a Sony phone. File transfer does work with this way on a Windows laptop but I'd rather not use someone else's machine. The phone does not appear to be mounted and does not appear if I try "lsusb".
Also there is no option on the phone available to select charge/file transfer by usb.
I have tried the suggestions for a Pixel 2 in previous questions and Android file transfer app without success. My older Sony and Samsung phones work fine. I Spoke to Google Helpdesk and they say it's not their issue contact Ubuntu Community.
Please can anybody help?