[web2py] How to intervene in web2py's upload process(store/retrieve/stream...) to do something with uploaded file?

My database is RDBMS, but i want to store uploaded file in a Key/Value storage(NoSQL). How can I intervene to web2py's store/retrieve process? I want temporarily store uploaded file in memory, then call my API to put this in-memory file to my Key/Value storage. When I put this in-memory

[web2py] Urlshortening appliance ERROR!

I download newest version web2py and download this appliance from https://github.com/mdipierro/web2py-appliances/tree/master/UrlShortening But when i run, i can't shorten URL. (No input form?) And when I click Bookmark button: type 'exceptions.KeyError' '127.0.0.1:8000' Traceback (most recent