Step 1: To add media to a category, first select the category that you'd like to add media to:
Step 2: Click on the "Save" button and the media will upload. If you have more media to add, click on the "Save and Upload More" button.
After the upload completes, the media will appear in the category you selected. You can edit the file by clicking on the corresponding "Edit" button.
In this section, you may create a name for the media file as well as upload a thumbnail image. You may also select the language(s) the file appears in, and select other categories you would like to add to it.
When you are finished editing the media file, you will want to make sure and click the "Save" button.