1. First you need to login to your Seed and then go to Media and select library.
2. From this page you can drag and drop the files to upload on your server media library.
3. Then you will see dialog box from where you can select a file to upload.
4. You will be able to see the uploaded file like this in media library and whenever you need to upload this on your courses of web page you need to click on add file you will be able to see media file in this list.