Uploading a file to the Moodle Files area is a simple process. Content in the files area can be linked to various resources after it is uploaded. Files can also be uploaded when adding various resources. Please see the article titled “Adding a File as a Resource” for details. The instructions for uploading a file(s) are as follows:
Once you have logged into Moodle, navigate to your course, then go to the Administration block and select "Files."
In the Files area window, select the "Upload a file" button as shown below by the red arrow.

Browse to the location on your computer or networked drive where the file is located. Once you have found the desired file, select the "Upload this file" button as shown below by the red arrow.

You are returned to the Files area of Moodle, and you should see the file you uploaded. In this example, the file that was uploaded is shown below by the red arrow.
