To add a video for Jean-Baptiste Krumpholtz / Sonata for harp, with violin & cello ad lib in G major, Op. 12/3, just enter the video‘s YouTube link:
example) https://www.youtube.com/watch?v=XXXXXXXXXXX
Search YouTube for Jean-Baptiste Krumpholtz / Sonata for harp, with violin & cello ad lib in G major, Op. 12/3