Add xref to Add Files in Video docs

docs/en_us/course_authors/source/create_video.rst

@@ -237,6 +237,8 @@ You can provide transcripts for your video in other languages. To do this, you'l
 
 #. After you've obtained the .srt files for additional languages, upload the .srt transcript files for those languages to the **Files & Uploads** page. Make a note of the URL for each .srt file.
   
+   For more information about uploading files, see :ref:`Add Files to a Course`.
+
 #. In Studio, open the Video component for the video.
 
 #. On the **Advanced** tab, scroll down to **Transcript Translations**, and then click **Add**. Two boxes appear above the **Add** button.