Board Thread:Support Requests - Community Management/@comment-37498053-20190102051526/@comment-27345308-20190103081541

Hmm. There is a possibility of directly linking the images you're trying to embed in the original format by copying the "original file" link from their file page and then placing the link on other pages. However, this makes the file unable to show a lightbox when selected, doesn't show backlinks to it in Special:WhatLinksHere (and might appear on Special:UnusedFiles) and may require some template modifications to display inside of the infobox.

Your best bet here is probably contacting Staff to see if they have any other solutions or, if they don't, create a ticket for adding APNG support to Vignette. I don't know how prioritized could that ticket be, so you couldn't really expect anything.