The update is now live on iOS and Android, changes are the following:
Features: Action skills and augments are now selectable and may be saved with your builds. A skill summary list has been added where you can easily scroll through all the stats gained from your passive skill tree.
Quality of life: The last saved build will be automatically loaded when you start the App.

The Borderlands 3 Skill Tree App has been updated to version 1.1. Changes include:

New features: Delete Builds. Switch between Tap to place and Tap for Info. Quick buttons to Max and Clear skills.
UI Improvements: New Font for important elements. Layout tweaks.