can't get file transfer working. Help, please!

[quixote]

This feels very dumb, but I just can't get it.

• connected via USB cable. Supposedly just shows up in Dolphin. In my case, No. Not under Network Places, not anywhere that I can see.
  
• I really really really don't want to go the whole ssh route. For me, that's a huge bother just to transfer a file or two every couple of weeks.
  
• bluetooth: seems to work ok on the pinephone, but I just can't get it to work on the desktop. So apparently that's out. Seems to be a hardware issue? (Generally, I never use bluetooth.)
  
• smb: I guess it should work, but I don't see how or where. I've never used it so I have no clue where to start.
  
• ftp: keeps asking me for hostnames. I don't know. Mobian? 10.60.0.10:21 (for ordinary ftp). I downloaded filezilla on the desktop in the hope that would help, but it doesn't seem to see either the usb-attached local device or tell me what the hell it wants for host name etc.
  

It's been so long since I've had to fight with this sort of thing, I don't remember, at all, any possible solutions.

What I'd *really* like is for the pinephone filesystem to show up in Dolphin when the usb cable is attached, without any fuss or muss.