Android File Transfer stopped working with Droid Turbo

This is vey likely already posted in this forum somewhere, but it wasn't readily apparent so thought i'd post t again.

When trying to transfer pictures from my Droid Turbo phone to my MacBook, as soon as I connect the USB cable to the computer, I get a pop up box that says Can't Access Device Storage and tells me to unlock my screen.

The screen isn't locked. I've done a Google search on this issue, but none of the solutions seem to work.

Thanks for any assistance you may give, And...

Android File Transfer stopped working with Droid Turbo

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