TileSets
Standard Format
The standard save format of the library is a row of 16 tiles, if there is a variant, placed directly below the corresponding position.
Ideally you should provide sprites with transparency channels.

Supported Format
-
You can download tile sets from these sites:
For tiles in non-standard cases, conversion functions are provided.
RPG Maker XP tiles

RPG Maker MV tiles
Tiny tiles
Wang tiles
Packed Format
Questions and Answers
Q: Is the save format too wasteful?
Yes, this resource format will have a lot of useless transparent pixels.
But this is just a lossless resource format for editor, it will compile into a compact format in game.
And thanks to the png compression algorithm, it doesn't take up too much extra disk space
Q: How about import 3-tiles or 4-tiles?
The library does not (and will not) support this, you must You have to manually decompose into 2-tiles.
Q: NavMeshes, Layers?
This library is only for resource management, please use TileMap for related functions.