Thanks for getting back to me! Heres how I think you could improve compatibility: When you slice a tilemap using Unity (turn it into individual tiles), it changes the meta file of the tilemap png. This meta file holds all of the details for the slice and the asset, and can be found in a file explorer (Unity hides these files). Tilemaps must be sliced in order to easily add them to a tile pallet. If you were to slice the tilemaps in Unity, then copy the meta file into a separate folder in the modern interiors folder (with the same structure, just meta files instead of pngs), then it would be easy to just copy the contents of the Unity folder into the enclosing folder and merge all folders together.

An issue of this would be that Unity meta files are many times larger than the tilemaps themselves. Maybe you could include the Unity meta files as a separate download, so users who don't use Unity wouldn't unnecessarily use up disk space.

Sorry if my suggestions are hard to follow, I'm not the best at explaining things. I hope this helps, and I wish you the best of luck if you try to implement this!