Create a mission that utilizes custom textures.
If whilst in the editor you modify these image files, these assets are not updated when previewing the mission in the editor.
Reloading the mission or restarting the editor does not reload the modified asset into the mission preview. Users have to close the editor and restart ARMA 3 then restart the editor for the ARMA 3 cache to be refreshed. Surely when previewing a mission in the editor the editor should check for changes to any asset and then reload any modified file. This is much closer to a bug than a feature request. :) {F24060}