You can make one or more projects.
Every project will realize a single time-lapse video.
eg. a day by day time-lapse or a make-up time-lapse.
Add the first photo.
Important: use always the same device and orientation for a project.
If you start making photo with an iphone 6. Use alwayt that smartphone for the project.
You can export your project as an animated gif and share it.
After exporting a project you can continue add more photos and export the project again.
Try to schedule the photos with the same interval of time, ex.: every day/week/month or year.
Make the photos with similar lites and backgrounds.