[Rails] File sharing site tutorial?

I've been thinking of doing a RoR application for a file sharing site a
la imgur, but for other kinds of files (Namely 3D modeling stuff.) Is
there a decent tutorial for this sort of app? I've been told that
paperclip for ruby might be a decent place to start, but I could see a
lot of landmines in this sort of app.

Sorry in advance if this gets asked twice a day - this is my first post.

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