Not for AirDrop, at least. You must be within RF range (~9 meters). https://en.wikipedia.org/wiki/AirDrop#:~:text=AirDrop%20uses....
> So, considering the solution needs to be cross-platform the easiest way to get something up and running would be through a web browser.
Yes, and Snapdrop seems to meet his 4 requirements: https://snapdrop.net/
iOS 17.1 allows you to begin a transfer when close by, but keep it going over cellular data so you don't have to wait around the person to finish it:
* https://www.macrumors.com/how-to/ios-use-airdrop-without-wi-...
Not for AirDrop, at least. You must be within RF range (~9 meters). https://en.wikipedia.org/wiki/AirDrop#:~:text=AirDrop%20uses....
> So, considering the solution needs to be cross-platform the easiest way to get something up and running would be through a web browser.
Yes, and Snapdrop seems to meet his 4 requirements: https://snapdrop.net/