function appendData() {
var sheet = SpreadsheetApp.getActiveSheet();
var folderId = DriveApp.getFolderById("FolderID");
var files = folderId.getFiles();
while (files.hasNext()) {
var tempFile = "";
var file = files.next();
// if the file is not a Sheet, skip it
if (file.getMimeType() != "application/vnd.google-apps.spreadsheet") {
tempFile = {
"title": file.getName(),
"parents": [ {
"id": folderId
}]
};
file = Drive.Files.insert (tempFile, file.getBlob(), {"convert": true, "supportsAllDrives": true });
}
Thanks in advance!