Flippity is a site that I have recommended for years as a place to find templates that you can use in Google Sheets to make things like flashcards, quiz games, and random name pickers. Recently, I noticed that Flippity has added a template for making multimedia timelines.
Flippity's multimedia timeline template is rather easy to use. To use it, simply make a copy of it from Flippity's homepage and then fill in the information that you want to display on your timeline. You can include text, pictures, videos, and slideshows within each event on your timeline. To include pictures, videos, and slideshows you paste the URLs at which they're available online into a column in your Google Sheet. Publish your spreadsheet to the web after you have entered all of the information and media links that you want to display. Your published spreadsheet will then be used by Flippity to generate a multimedia timeline that you can view online. Take a look at this sample to see how a timeline made with Flippity looks.
Applications for Education
If you're looking for a flexible and free tool that your students can use to create a multimedia timeline, Flippity's free timeline template is worth trying. Students can collaborate on making a timeline by sharing the Google Sheet in which they are entering dates, text, and media.