I’d like to know how if the Kies Air app can store data from a third party, like text files (i.e. a story) or text from a reader app?
Kies can't, but there are plenty of apps that can store on cloud storage (Dropbox etc), so you could use such a combo instead.
Kies Air works with samsung devices only! and works with samsung inbuilt application to do specific jobs
I don't think it would be able to do so.If it was able to do so,then this app would have been seen as suspicious app.Usually,an app is not allowed to read data from another app.