Importing and using tilemaps

Tiled

Select: File 🠞 New 🠞 New Tileset...
Select the tilemap image file
Find the tile width, height and spacing values in the included tilemap.txt file

Right click 🠞 Insert New Object
Select the "Tilemap" component
Click the folder icon and select the tilemap image file, then close the dialog
Select the tilemap object
Copy the tile width, height and spacing values (X and Y are the same) in the included tilemap.txt file

Add the tilemap image to your project
Select the image, and select "Sprite (2D and UI)" as texture type
Set sprite mode to "Multiple" and click the "Sprite Editor" button
On the top of the new dialog click "Slice" and select "Grid By Cell Size" as type
Copy the tile width, height and spacing values (X and Y are the same) in the included tilemap.txt file
Click "Slice" and close the dialog
Select: Window 🠞 2D 🠞 Tile Palette
Click "Create New Palette", then "Create" and select a folder to save
Drag the tilemap sprite onto the palette and select a save folder
Select: GameObject 🠞 2D Object 🠞 Tilemap
Set the grid size of the tilemap to the tile size divided by 100 (i.e. 16px = 0.16)