Knightlab makes it fairly (ehh) simple to make great interactive timelines:
Amendments to the US Constitution & the Associated spreadsheet
American Vernacular Music & the Associated spreadsheet
1. Create a title and 3 instances for your timeline.
2. Add an image to one instance and a video to another instance.
3. Change color of slides if you want. Use the HTML color code to find out the values of different colors. This goes in the Background column. (examples below)
Knightlab has step by step tutorials on creating your own timeline: