Interactive Video

Add webp to supported image types for Interactive Video image

BACKGROUND

Currently the Image (thumbnail / preview) for an Interactive Video does not allow the webp image type in the editor. Attempting to submit a webp image as a thumbnail generates the following error message in the Interactive Video editor:

First time trying to create an interactive video. Having some trouble.

1) I cannot get the interaction to start when I want. The interaction starts at the very begining of the video, but I want it to start 40 seconds in.

2) The interaction does not stop the video. I have a multiple choice quiz. The video just plays on without stopping, whether the quiz is answered or not.

3) I don't understand what the "Summary Statement" is about, and I don't want it. But I cannot seem to save the project without it. How do I get rid of this?