Image gallery improvements
Upload images in bulk and clear out unused ones in a single action.

- Upload images in bulk. When you add an image block, drag and drop multiple images at once and they auto-select and add to your email together.
- Ideal if you design a batch of images in Canva or elsewhere and want to drop them straight into the gallery and add them all in one go.
- Bulk delete unused images. In the "Unused" tab of the gallery, select all and clear them in a single action.
- Keeps your image gallery tidy by removing images you no longer need.