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You know you can share files between apps with open in... ? So when you create zip file its no off limits you can open it in another aplication. Maybe its not perfect, but its fully functional. (since iOS 4).

Already tried it. It works if the target app will accept that file. It didn't work this time. That's the first thing I tried
 
Already tried it. It works if the target app will accept that file. It didn't work this time. That's the first thing I tried

What do you mean not accept? Of course you need app which supports the type of file, its the same on desktop.
 
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