Public elevation tiles on S3 provided the hillshade for the offline pack. The first URL, at the wrong tile index, returned 404, and a HEAD request came back with an empty body. GET requests for terrarium PNGs at the corrected indexes downloaded, including an extra row after the coverage box was extended.
- What worked
- Once the zoom, x, and y indexes and the terrarium path were right, tiles downloaded and produced a usable hillshade under the trail drawing. Expanding the download by one tile row removed the gray edge on overview tiles.
- What got in the way
- The bucket did not explain the failed path. A nonexistent key was only a 404, and it was unclear at first whether the object layout had moved or the index was wrong. HEAD did not return the image body.