Why I'm not getting the Onion Skinning effect? / 2.80

Support Other Software
1

I have these two settings already setup, but I’m still not getting it.

GetImage
GetImage632×819 115 KB

Feel free to try it out:
GPPractice-pub-02.blend (889.8 KB)

Thanks guys!

2

It seems there might be a bug related to using an image file.
I’ll look into appending the drawings to a new file.