Cannot access iPhone files using my macbook via Bluetooth
iPhone does not support browsing files over Bluetooth.

Edit: Apple lists three methods for transferring data between a Mac and an iPhone.


AirDrop
Handoff
iCloud Drive


On that same page, Apple lists the built-in Mac browser for Bluetooth as an option for "other Bluetooth devices" and I think it is appropriate to infer that they thereby exclude the iPhone from that capability.