The Visual Vocal mobile app allows users to download and remove Vv content from their phones at any time. If the Visual Vocal app is taking up too much storage on your device, consider removing the downloaded Vv content from your phone. It can always be re-downloaded later on.
The size of your Vv can also be tracked in the Web Portal. The Vv size is located in the top right corner of the authoring page. The larger your Vv, the more storage space it will take up on your device. If your Vv size is entering the red zone, you may want to consider dividing your content into multiple Vv's, each focusing on a different aspect of design.