From documentation https://developers.google.com/drive/picker/guides/sample
Go to https://console.cloud.google.com/iam-admin/settings Use Project number for APP_ID in
new google.picker.PickerBuilder()
.setAppId(APP_ID)
Then in pickerCallback
const urls = data.docs.map(document => 'https://www.googleapis.com/drive/v3/files/' + document.id + '?alt=media')
Then use the token you received during authorization and the download links.
example download
https://stackoverflow.com/a/45324466/19596385
https://stackoverflow.com/a/36215442