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https://docs.netlify.com/site-deploys/create-deploys/#deploy-to-netlify-button

I added a file called _redirects to the root of my project. It contains one line:

/download/*  <https://clearleft-audio.s3.amazonaws.com/podcast/:splat>  200

That says that any URLs beginning with /download/ should redirect to clearleft-audio.s3.amazonaws.com/podcast/. Everything after the closing slash is captured with that wild card asterisk. That’s then passed along to the redirect URL as :splat.

Source: https://medium.com/@adactio/netlify-redirects-and-downloads-6d60fec351ba

Reference: https://docs.netlify.com/routing/redirects/