Add support for FLVs back

Hi! I'm an animator who frequently uses Adobe Animate and I've been trying to implement videos to animate over and/or manipulate . There's one major issue though...

Adobe Animate supports .mov, .mp4, and .flv video formats but only properly displays .flv files when exporting the Aniamte document into a .swf file. Media Encoder used to support the .flv format but in recent additions removed it entirely. The only other way to implement videos in Animate is to export the video as a PNG sequence, but that can bloat your file size like crazy. Not to mention copy and pasting png sequences from one file to another just breaks the files even more.

Additionally, various Adobe written posts and tutorials tell me to use Media Encoder to convert files into .flv that were updated recently. This is clearly incorrect as you can no longer export anything into an .flv format.

I have 2 solutions; 
1. Add support for FLVs back into Adobe Media Encoder

2. Allow MP4s and MOVs to display on the timeline & stage of Adobe Animate and SWF files

If neither of these are possible, I would appreciate suggestions of other convertion software that can take video files and convert them into an FLV that woks in Adobe Animate. (Also maybe edit the tutorial posts saying you can convert files into FLVs with Media Encoder beacause well... you can't.)