Step 1: In Canvas click on the Studio icon located on the blue sidebar. 

Step 2: To upload a video or audio file, you can drag and drop the file into Studio [1], or you can click the Add icon [2].

Step 3: After you click the Add icon, you can drag and drop file(s), browse for files, or add a YouTube video. To select files to upload, click the Browse Files button [1], locate and select the file(s) on your computer [2], and click the Choose or Open button [3]. To add a YouTube video, copy and paste the YouTube link into the URL field [1] and click the Add button [2].