"Unrecognized content encoding type" error when uploading an image

I am trying to fetch images that I have uploaded to my CDN. I used canvas.toDataURL to convert my images to PNGs before upload.

I get the following error when I try to fetch the images: Error: cURL error 61: Unrecognized content encoding type. libcurl understands deflate, gzip, br content encodings

So first I created this image using FabricJS: Then I am exporting it as a PNG using:

const dataURL = canvas.toDataURL({
    width: canvas.width,
    height: canvas.height,
    left: 0,
    top: 0,
    format: 'png'
})

Then I am uploading it to my S3 CDN using:

async function uploadPNG(dataURL, filePath) {
  const buf = Buffer.from(dataURL.replace(/^data:image\/\w+;base64,/, ""),'base64')

  const uploadParams = {
    Bucket: bucketName,
    ContentType: 'image/png',
    ContentEncoding: 'base64',
    Body: buf,
    Key: filePath
  }

  return await s3.upload(uploadParams).promise()
}

Then I am trying to upload that image (which is now in the S3 CDN) to a WooCommerce site using their API. https://s3.eu-central-1.amazonaws.com/cdn.blankt.com/product/s/AY6AJSHMXnf2ReCZOu.png

Here is part of that API request:

{
  "name": "AY6AJSHMXnf2ReCZOu",
  "type": "variable",
  "regular_price": "9.90",
  "sku": "AY6AJSHMXnf2ReCZOu",

  ...

  ],
  "images": [
    {
      "src": "https://s3.eu-central-1.amazonaws.com/cdn.blankt.com/product/s/AY6AJSHMXnf2ReCZOu.png"
    }
  ],
  "attributes" : [
    {
      "name"      : "Size",
      "variation" : true,
      "visible"   : true,
      "options"   : [ "A3", "A4", "A5" ]
    }
  ]
}

And this is the response that I get:

This problem seem to only appear when I try to upload the image using the API, if I download and upload the image manually to WooCommerce, there are no problems.

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