By default the Total theme displays auto excerpts generated from your blog content for the archive entries, this uses the WordPress function wp_trim_words which strips out all HTML. This can be easily disabled via the Customizer but you can also make use of the WordPress “more” tag to define custom excerpts that also keep all HTML/images/videos..etc.
Using The More Tag
You can use the “More tag” in your posts to tell the theme exactly where you want your excerpts to end. See the screenshot below: