There are some limitations to how many photos and videos you can add to your project. Please also be sure that you have plenty of available space on your device to accommodate your project as well.
Your video is created by the device itself, not by a machine on a distant server. This process takes a little power. Below are some limitations:
- iPhone 4 and iPad 3: up to 25 elements. Both devices are not powerful enough to generate bigger videos.
- All other iOS devices: up to 200 elements.
- Android devices: up to 75 elements.
The less powerful your device is, the less magic it makes, the more that the app may crash.
Keep in mind that the more media you add, the longer the video will take to export.
Your video is also limited by the length of the music. So be sure your audio is long enough to match with how long your content is.