Flash is dead... Or am I wrong? (Yes, I know that HARMAN still creates updates from time to time)... Nonetheless, I don't really think that many users still use it for content creation.
The flash importer consumes work on our side: It's part of our CI system and we have to test TexturePacker with it. But a feature that nobody uses is a waste of time.
If you still use .swf files as a source image format to create sprite sheets contact us at email@example.com .
This is important because we'll otherwise remove .swf file support with one of the next TexturePacker releases!
The FlashUnpacker is an addon for TexturePacker that allows you to extract animation frames from Flash animations (.swf files) and pack them on a sprite sheet. The tool is available from Windows and macOS: