Yes epub3 officially supports some specific audio and video file types. Adding media files is quite easy in Sigil using the Add Existing menu. You can also use the Insert Link menu item. Standard html5 audio and video tags work. There are sample epubs that have been posted to Sigil in the past. Search the Sigil and epub forums here.
The real question is what e-readers support it.
Last edited by KevinH; 07-29-2021 at 09:38 AM.
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