Edit file and save in another app

[mharis99]

Hi, I have a question:

The scenario is:

1 - I have a file in my app with docx extension(which is online)
2 - I want to open this file in my android in an office app
3 - I edit the file in an office app
4 - when I close the app(office) after editing the changes will be reflected in the file in my app.

Its same like dropbox does.

Please show me the way to achieve this.
Thankyou