Per beat: edit the Description (left) and Voiceover (centre) inline, and drag & drop or click to set the Image (right). Hover a beat for its tools: drag the handle (or use ↑ ↓) to reorder, Split to break a beat in two at your cursor, ✕ to delete. The Voiceover button up top shows the whole narration as one block to copy out or bulk-edit. Everything saves in this browser.
The complete voiceover as one block, one paragraph per beat, in storyboard order. Copy it out to edit anywhere, or edit it here and apply it back to the columns (keep one paragraph per beat, separated by a blank line).
Every save creates a snapshot, capped at the last 50. Click one on the left to preview it. Restore replaces the whole storyboard. Or copy a single section into your current version to combine them.
Pick a version on the left.
Every save is stamped with your name so the history shows who did what. You only have to do this once per browser. Change it any time in the top bar.