To add a video for Johannes Schenck / Sonata No. 4 in E flat major (from LEcho du Danube), Op. 9/4, just enter the video‘s YouTube link:
example) https://www.youtube.com/watch?v=XXXXXXXXXXX
Search YouTube for Johannes Schenck / Sonata No. 4 in E flat major (from LEcho du Danube), Op. 9/4