Can you fly 2 drones near each other?
You can, but drone pilots recommended that you are very, very careful. There seems to be no rule or regulation against it from what I read. However, some people have reported radio interference when using same drone types and controllers while Pilot in Commands (PIC) were close to each other.
Can you fly drones in different countries?
Identifying the civil aviation authority in the country you're traveling to can help you learn about the drone laws in a specific country.
How can a link a new remote controller to the Phantom 4 Plus?
See the video below.
https://www.youtube.com/watch?time_continue=101&v=zKa8F1rsx-o&feature=emb_logo
