This error has recently popped up today after trying to export an animation (adobe animate 2021) whenever it did manage to export the mp4, the symbols and the camera in the video
How can I export an animate file with a transparen... - Adobe Support Community - 10998907
Exporting to .MP4 in Animate 2020 - Adobe Support Community - 11076473
Solved: Adobe Animate exporting video as black screen with... - Adobe Support Community - 9982356
Adobe Flash: How can I convert a swf object to a known video format as mp4? - Quora
How to Save an MP4 in After Effects
Export After Effects animations to HTML5 | Creative Bloq
Solved: Animate 2021 export video/media: mp4 looks terribl... - Adobe Support Community - 12401521
Animation for Beginners, Adobe Animate Lesson Plans | TechnoAnimate | TechnoKids Inc.
Using marketing animation to amplify your communications - Three-Brains
How To EXPORT Animations from Adobe Animate CC to Video Files (mp4 & mov) - YouTube