in each topic if you started a post but didn't finish it and saved it (floppy disk not showing a green dot) it will show up once you enter that specific part of the forum where you started it
I think there should be a purple button that mentions that you have a saved draft there asking if you would like to see it/open it in order to make further edits/post it
if you created a draft and the floppy disk had a green light and you didn't save before leaving it or exiting it will save the last known draft or a blank text box if it didn't automatically save the first few things you typed
profile posts do not have a saving function/draft function as far as I know if you're referring to those
hope this helps
some example images