The Flash Episode: Saving a Medium, A History of Flash, The Death Blow and the Death, Ruffle The Flash, Flashpoint, An Audio/Video Conversation.

The Internet Archive now supports emulating .SWF files (Flash) that were a critical part of the web whether it should have been, or not. Dozens of new, playable animations are flying in all the time. The top level of the collection is https://archive.org/details/softwarelibrary_flash

The excellent emulator of Flash is Ruffle, at http://ruffle.rs

The most important Flash is Badgers. https://archive.org/details/flash_badger