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No, it is not impossible to download a file from AWS S3 and transmit it through fetch. In fact, you can use the AWS SDK for JavaScript to download the file from S3 and then transmit it through fetch. Here is an example code snippet that shows how to do this:

// Load the AWS SDK for JavaScript
const AWS = require('aws-sdk');

// Set up the S3 client
const s3 = new AWS.S3({
  accessKeyId: '<your-access-key-id>',
  secretAccessKey: '<your-secret-access-key>',
});

// Set up the download parameters
const params = {
  Bucket: '<your-bucket-name>',
  Key: '<your-file-key>',
};

// Download the file from S3
s3.getObject(params, (err, data) => {
  if (err) {
    console.error(err);
    return;
  }

  // Convert the file data to a Blob object
  const fileBlob = new Blob([data.Body], { type: data.ContentType });

  // Send the file through fetch
  fetch('/upload', {
    method: 'POST',
    body: fileBlob,
  }).then(response => {
    console.log(response);
  }).catch(error => {
    console.error(error);
  });
});

Note that in this example, we are downloading the file as a Blob object and then sending it through a POST request using fetch. You will need to replace <your-access-key-id>, <your-secret-access-key>, <your-bucket-name>, <your-file-key>, and the fetch URL with your own values.