Your device storage is low

As video files can tend to be on the larger size Slatable needs enough space to do its thing. When you get this alert it means you have less than 8GB of storage on your device. Device storage is different to iCloud storage. You need at least 8GB of free space on your device for Slatable to be able to compile.

Steps to take:

1. Remove any unused Takes from previous auditions.
2. Restart the device if you don't see a change in the amount of storage left.

Other steps:

1. Turn on iCloud Photos and optimize storage. See this Apple article here.
2. Transfer the photos and videos that you don't want to store in iCloud to your computer.  See this Apple article here.