Are you maybe running through an http proxy maybe? My site runs apache and although cloudflare our CDN/DDOS provider does use nginx it would have their logo and branding on the 413 page if it was from them.
I'm not able to reproduce the error using multiple ip addresses (some that arent whitelisted anywhere) on my infrastructure. I was able to upload 10mb - 40mb zip files through the AddOn manager page with out any error.
So I am wondering where that generic 413 error page is from nginx is coming from.
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