This is a paid asset, but now you can download Isometric Tilemap Auto Collider for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Isometric Tilemap Auto Collider v1.0
You can upgrade to Procedural Isometric Map Generator by just paying the difference in pricing!
Isometric Tilemap Auto Collider enhances your tilemap creation by automatically creating colliders for your tilemaps.
This asset can handle even the most complex isometric tilemaps.
Setup takes about 30 seconds per grid independent of the tiles used. Collider creation takes less than 1 second for up to 10,000 tiles.
Isometric Z as Y tilemaps are not supported yet. Let me know if you need support for it.
Assets for demo scenes are from 2d-extras and 2d-techdemos repositories of unity and they are included in this asset. You can get the latest versions of these assets from:
1. 2d-techdemos – MIT License: Github link
2. 2d-extras – Unity Companion License: Github link