“File sharing re-imagined for the social age” – Requesting feedback

I want to gather some initial feedback on an idea I had for a new social file-sharing app. Think Instagram, but for all types of files. I would be developing this primarily on my own.

I feel I have thought about all the potential pitfalls I might face, but it's always good to get second opinions. I don't want to waste my time, only to be swiftly outdone by Facebook, if I don't get it right.

I have made some mockups of what I am imagining. You can view them on Behance below.
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"File sharing re-imagined for the social age" – Requesting feedback