Remote File download in ionic 4

I have been battling with file download in ionic 4 and it seems to be a big issue for me.
The below code is what i have tried using atlast but it seems not working as the same is downloading the file to a directory that i don’t have an idea in the device.

ownload(filename) {
const fileTransfer: FileTransferObject = this.transfer.create();
let name = filename.split("/");
let length = name.length;
const url ="" + name[length - 1];
console.log("clicked", name);, this.file.dataDirectory + name[length - 1], true).then(entry => {
      console.log("download complete: " + entry.toURL());
    error => {
      // handle error
      console.log("ERROR: ", error);

I don’t know how i can save it to like downloads folder or gallery like that in case of images.