Raymond Camden is a Senior Developer Evangelist for Adobe. He works on the Document Services APIs to build powerful (and typically cat-related) PDF demos.
I just checked in the CodePen (which I somehow forgot to share - codepen.io/cfjedimaster/pen/ymvMpj) - and it looks like Fetch set it automatically. (I totally didn't know that though.)
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Thanks for taking the time to share this more widely!
Don't forget to set the Content-Type header to multipart/form-data!
I just checked in the CodePen (which I somehow forgot to share - codepen.io/cfjedimaster/pen/ymvMpj) - and it looks like Fetch set it automatically. (I totally didn't know that though.)