there is a little cogwheel icon for settings, hover over that and it will bring up the settings tab
from there you will see a paper icon with a green arrow and a paper icon with a red arrow
green is to upload previously saved flipanim files, red is to download what youre currently working on.
after you have saved a file you can then email it to someone, use a file sharing website and link them to it, send it over discord, or any other number of ways you want