1. If you are using an IPhone, you can use the voice memo app to record your audio. The following link instructs you how to this:
If you have the Google Drive App installed as well, you can save your audio file in Google Drive by using the share button. This makes it easy to upload the file in your Moodle assignment
2. If you are using an Android Phone
https://www.wikihow.tech/Record-Voice-With-Android