有什么方法可以让 android 设备作为 ftp/sftp 服务器通过 java “不在本地”通过互联网运行？

Question

I tried to make android as FTP server
it's a success in the local network by the library

I am tried by swiftp library but it's work only in local network
in swiftp lib you must open wifi or open hotspot wifi torun server and you can access to your files in local by FTP protocol
I want to make app like swiftp but work over the internet that can access to my android files from anywhere!
any help?

Answer 1

Not possible.

You stated that your phone would use a simcard to connect to the internet.

Your phone can run a server but you will not get incoming connections from the internet as your cellcard provider blocks them.