One of the big problems of the smartphone devide between Android and IOS is the file transfer.
You either cave and store your files in the cloud leaving them to unauthorized access or just don't share them at all.
What happened to locally sharing files between devices?
The File Sharer solves this problem: You can provide a small web interface where anyone in your network can upload any file and download all the files you provide.
You can either let people use your hotspot or your router.
Only share files over networks you controll as this app does not use any security.