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I ended up using a combination of this answer:
https://stackoverflow.com/a/36894564
and this snippet:
https://gist.github.com/javilobo8/097c30a233786be52070986d8cdb1743
So the file gets downloaded in the response data(result), I added more meta data tags to the files to get the file name and title. Finally adding the link to the DOM and executing a click() on it saves the file named correctly. Full solution below:
getFile (fileKey) {
Storage.get(fileKey, {download: true}).then(result => {
console.log(result)
let mimeType = result.ContentType
let fileName = result.Metadata.filename
if (mimeType !== 'audio/mp3') {
throw new TypeError("Unexpected MIME Type")
}
try {
let blob = new Blob([result.Body], {type: mimeType})
//downloading the file depends on the browser
//IE handles it differently than chrome/webkit
if (window.navigator && window.navigator.msSaveOrOpenBlob) {
window.navigator.msSaveOrOpenBlob(blob, fileName)
} else {
let objectUrl = URL.createObjectURL(blob);
let link = document.createElement('a')
link.href = objectUrl
link.setAttribute('download', fileName)
document.body.appendChild(link)
link.click()
document.body.removeChild(link)
}
} catch (exc) {
console.log("Save Blob method failed with the following exception.");
console.log(exc);
}
})
}
}
Source:stackexchange.com