https://www.youtube.com/watch?v=TTY4ujDiUwc

The player has an area around them that is actively held in the RAM. This area is around 150 tiles in diameter. Everything outside of it does not exist anymore so if you are trying to copy and / or paste areas that are outside of that scope it will not be properly done.

It is generally best to split large areas into multiple blueprints and keep the player in the middle of the area during operations. To create a Blueprint folder, just name the blueprint "My folder name - The name of the blueprint part"

• Tiles, including grass, trees and other sprites.
  
• Moddata stored within a tile

• Container tile contents to not bloat the ini file too much.
  
• Building and / or room definitions. Lots of prebaked houses have no proper "roof" and instead rely on room definitions to mark the space as enclosed. The room definition not being copied will be noticeable when copying these houses. Player construction is a-OK.
  
• Water tiles. These will be replaced by sand because during testing water sprites could sometimes break the chunk leading to it being reverted.
  
• Tile properties that differ from the tile pack. If you have a building tool that explicitly sets things unbreakable for example, even if the tile itself says it is breakable, it will adhere to the rules of the tile definition.

• The blueprints are stored locally in your Zomboid Userdata folder, Lua, "btse_blueprints".
  
• You can copy and paste between savegames, game modes, servers (as long as you have the rights to do so). The only limitation is enabled tile packs. If one is missing it will point that out in the blueprint selection.
  
• I can't stress this enough: DO NOT select the text when pasting a blueprint string. The game will go into meltdown because of the text highlighting.
  
• By default the tool is available to admin rank only. To change that, use the sandbox variable for the blueprint tool whitelist. Everybody with staff rank can be enabled to use it and this list will be used instead of the admin rank.