While in the creation process, if you tap the "x" in the upper left corner of the screen, you'll see a prompt asking if you want to save a draft or discard the post. Tapping "Save" will create a draft of your post which you can resume editing by going to the "My posts" tab in the lower right corner of the home screen and then tapping on "Drafts."
In the desktop version, the draft can be located by clicking on "My posts" at the top of the screen and then "Drafts."
Please note that selecting "Discard" will delete the post completely.
