Hello,
Hou have a problem for Open a Server on Android version ? I have the solution.
Go play in singleplayer and exit, and create a folder with name "world" in folder "worlds".
After, for URL server, no enter URL. And next, writte your username, password and port .
And press bouton "connect" ... Tadam, your Host à server in Android version.
Complicate ? Glitch, i dont know... For version in play store and fdoid, no problem.
Create Server in Android iS possible, this is only hidden ;) .
Good night ;) .