To upload a new file, you click on Upload file.

To upload several files, you can use Packed media files to upload Zip packs.

You can either add a file by dragging it and drop it in the box tagged with Drop a file here or you can click on Flip through and find the file where you have saved it on your computer.

The file is uploaded and added to the list with the other files.

How to add tags to files like Sound, Pictures, and Video.