Save Gmail attachment to SHARED Google Drive
Solution 1:
Move a file from MyDrive to Shared Drive
function movefileToSharedDrive() {
const file = DriveApp.getFileById('');//fileid
const fldr = DriveApp.getFolderById('');//shared drive id
Drive.Files.update({"parents": [{"id": fldr.getId()}]}, file.getId(), null, {"supportsAllDrives":true});
}
Drive API Version 2 needs to be enabled