Hey @ferares
I had the same problem with my camera, recently:
I found out, that i could connect my camera with the help from a little bid older iso (usbstick with live boot environment).
Where the autoconnection pop up… in Taskbar showed up, that normally won’t recognise under my normal Manjaro install.
I could mount he camera, only one single time there after i mounted the device with KDE Automount or Autodetect. But after i closed the dolphin browser after it. It won’t let me access the camera again.
Anyways, i had the pictures and i didn’t investigate anymore after that partial success.
I thought first this might be a KDE problem, but since you using Cinnamon, it must be something different then.