How do I work this Mingyu "clear file"?

Question

I bought this strange "clear file" from the dollar store the other day because I wanted to figure out how it worked. It has a strange mechanism inside that I just don't know what to do with. I have been messing with it for awhile now and decided I needed some help. The file says "Mingyu" makes it and "Made in China". Written across the front is "MINGYU OFFICE THING SERIES" if that helps.

Answer 1

Describe the mechanism. If you can't, then just send me a picture of yourself in a bikini.