In the “Database” tab, go to the “Media” sub-part. Then you can import your media, at the right side of the search bar. You can drag your file directly on the web page or browse from your computer, in the correct format (zip).
Make sure to check first if the voice actors associated with your clips are already in the database. If not, add it from “Database”> “Address Book”. Then, in the “Database”> “Media” tab, click “Import”. You can then download a template by clicking on the small file with the arrow. When your template is filled with the names, first names and path of your files, put it in the zip file with your samples. Then, drag it on the importation page or click on “Browse”.