I assume you don't mean 'share' but 'stream'.
Not 'on the road' you can't because WiFi has a range of 50 meters/150 feet max in the best of circumstances which hardly qualifies as 'on the road', does it?
What you
can do, though, is run free
Teamviewer on both devices and transfer whatever audio, video, and other files from the one device to the other, and then play it/them.
Or you can install a free personal cloud like
MEGA (
50 GB of end-to-end-encrypted storage space, outside US jurisdiction, accessible from any web browser on any device) and store your audio and video there for retrieval/download to your phone (or any other device) wherever you are.