Hi
@may71 From my experience, I believe they disappear after a certain time, whether you save them intentionally or it was automatic, no matter the length. Also, pretty sure they don't get saved at all sometimes... Other times, the saving button doesn't even work, so you know it won't be saved if you notice it. I save my super long posts on my computer because in general on the internet it only takes a tiny glitch or a lost connection for a second, and I can only recommend you to do the same

Sorry for your lost post, I know the frustration.