Manage files created by the app.

[ac_devel]

I have been developing an app and it turned out to be a useful one for a data collection. 
Thus, I all files created by the app are saved in the local storage before being sent to the server. I used to delete them but I wanted a sort of back up. 
I was wondering if I have to delete these files manually or if they are automatically removed once the app is uninstalled. 

Thanks in advance!

[Guy_]

@ac_devel- normally an uninstall releases everything relating to the app, as does a factory reset and possibly other things like a firmware update [in the past, maybe no longer].