Ubuntu 22.04 LTS only sees folders of Android smartphone, not their content

[Marco Fioretti]

Greetings,
I have a Samsung phones with photographs and some voice recordings I need to copy on my Ubuntu PC.
When I connect the phone to the computer via USB cable, the phone DCIM card,its subfolders (Pictures and Screenshots) and their content look OK. I can see all the pictures there, and copy them without problems.
The "Voice Recorder"  folder, instead, looks empty, even if I KNOW the recordings are there, I can play them on the phone. For that matter every folder except the DCIM one looks empty.
The damning part is that I **did** see and manage to copy some recordings from that folder in that phone, some week ago. But I don't remember what I did, and honestly have no clue what happened afterwards that made Ubuntu blind to everything but the DCIM card.
Suggestions?
TIA,
Marco
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