The attached json file has one tiddler. That tiddler has two droppable zones and each using a different macro.
The first droppable zone is for your images, all stored under one root image folder, that folder being in the same domain as your TiddlyWiki instance. You have to modify the related macro with the hard-coded bit of a relative path to your images.
The second droppable zone is for any image available via a server. The Tiddler titles will be just the file names, the _canonical_uri values will be the full URL to the files.
In all cases, the droppable zones expect URL links to the images. They are not meant for dropping actual image files.
Image Importing Droppable Zone.json (2.32 KB)