Re: Where are MMS-messages stored in Android 15 ?

Jesper,

When this Android 15 smartphone is connected to my Windows11 PC via USB,
it does not show up in Windows Explorer at all. And no message on the
phone about allowing access.

It might be that you first need to allow possible access to your phone,
after which you, on connection, get such a "are you sure" confirmation
dialog.

IOW, look in your phones settings.

Therefore I use an app, Cx File Explorer, for transfering files between
Phone and PC

An app on your phone to talk with the PC ?  That should mean that there is
nothing wrong with the connection/cable itself.

Regards,
Rudy Wieser