For most newer iPhones and iPads, simply tap the download button on the MP3 and it will be saved onto your device.
If you are using the following devices, you will need to install an external app to download MP3 tracks. This is because your device won’t be able to run iOS 13/PadOS 13 like newer Apple models.
- iPhone 6 or older
- iPad mini 2
- iPad mini 3
- iPad Air 1