(aws-amplify) Why progressCallback only gets executed when the upload is finished?

Question

const stored = await Storage.put(filename, file, {
    contentType: file.type,
    customPrefix: customPrefix,
    progressCallback(progress) {
      console.log(progress)
    },
  })

This only executes once the upload gets finished. What have I missed?

Answer 1

I've figured it out and the reason is actually quite silly..... The file for uploading is too small (1mb) to get more than one update regarding progress.