How does the mobile version of Minecraft use the fill command to turn the place it walks through into soil?

In the mobile version of Minecraft, you can use the "fill" command to fill the place where the player walks with soil. The following was the specific command code: ``` fill x y z : soil ``` " x "," y ", and " z " represent the positions of the instruction blocks. Enter the above instructions into any command box in the game's main interface and press the "send" button to fill the place where the player walks with soil. It should be noted that this command only applies to transparent blocks such as glass, lava, and sand. If you want to turn the block into mud, you need to use another command like "slide" or "heap".