@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 .
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).
