Remember that Audio preview on homepage posts is visible for “Classic” layout and first posts of “1 full + grid” and “1 full + list” layouts only.
Please go to
Posts > Add New section on your blog dashboard. While creating a new post, scroll down until you reach area below text editor. Paste full address of your hosted audio file to
Audio URL field.
Before post is published, make sure to add “Featured” image and select “Audio” format on the right side of post editor.