@keneda Thanks, but I finally found it under the cover of what I thought was the m.2 slot. I've got my bluetooth ear buds working using an ancient D-Link dongle which oddly works rather than the Plugable one that's supposedly the best for Linux .

@dobey oops, there I go not reading again...

@yuri
You'll need to be a little more specific.
Until we know if it's a device specific issue, I'll move your post to "Support".

MTP is an Android thing so it's not automatically available on the Pinephone and Pinetab. I think they do plan to have to though. For now you can use WifiTranser or SSH/SFTP (which I much prefer than wired connection).