media icon Glow Blogs support the addition of many different types of media. Some can be displayed from other sites by embedding and others by uploading to the site and added to a post or page.

There is information on adding different types of media on the Help Blog:

We also have a blog that demonstrated the embedding of over 30 types of external media: Embeds, Examples of embedding content from other sites on Glow Blogs. This ranges from giphy, through YouTube and Sway to the micro:bit code editor!