Download 1 to many excel files from Angular Api into zip folder

I've currently got a program that works in downloading a singular file from backend, constructing it into a blob and converting it to an excel. As seen below.

let filename = 'download' + this.EXCEL_EXTEN
await this.apiService.getDownload(info).then((response: any) => {
let download = new Blob([response.data]), {type: 'application/vnd.ms-excel' })
window['saveAs'](download, filename)
}) .catch((error) => {
console.log(error)
}


However, my requirements have changed. Instead, I'm being sent back 1 to many excel documents within a .zip folder and I'm not sure how I'm meant to construct the data properly. I've attempted to alter the type to be .zip, which does successfully download a zip, but the folder contains no data.

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