Video uploaded to YouTube channel CWCriminology. Upload date is 14 August 2021 sometime around 18:30 (6:30PM) UTC. Video had approximately 60 views (and the channel itself had 3 subscribers) at time of archival.
From the description of the video, it is somewhat obvious that it was uploaded by Fiona herself. For example, why does the description mention that the incest leaks "horrified [Fiona]"? How would they know this, and why mention this specific detail? How did they know that Bella "sent Fiona" the leaks, and why mention this specific detail? How did they know that Fiona was "on good terms" with Chris pre-incest, and why mention this specific detail? Additionally, the description does not specify through what means or why the poster has access to the video. However, it does state (or at least very very heavily imply) that at least one person (Fiona) has or had access to it by virtue of having animated it.
Exact original description (except for opening and closing double-quotes) as of around 10 hours after upload date read as follows; judge for yourself:
"A leaked promise sent by the notorious Chris Chan to an autistic woman
named Fiona that he wouldn't throw fits about the newest Generation of
My Little Pony around her during the Everfree Northwest convention held
in Seattle, WA
Fiona was on good terms with Chris back then, before Isabella Loretta
Janke sent Fiona the incest chat logs, horrifying her.
Animation created by Fiona herself on July 15 before the incest leaks."
archive.md of channel page at time of archival: https://archive.md/51TK9