"413 Request Entity Too Large" Shopify blocking requests over 1MB?

I’m uploading files to my server using axios, and it works perfectly on requests under 1MB.

However, when I upload over 1MB to my server in a single request my request is blocked and a 413 error is thrown. It shows it’s from NGINX in the response:

The request doesn’t reach my server and is blocked client side. Any help would be appreciated.