Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
Try an MTP connection, that could doubtfully work.
If that doesn't work, then try this:
in order to allow Android File Transfer to access your smartphone, you need to go at the
- login items
- android file transfer agent (tick the box)
and then restart your Mac, and Android file transfer should work after that.
Let me know how it goes, I may have other things to suggest.