(edit) Use the code below if nothing works
If that doesn't work you can do this: (remove the comments // if you are not going to use this in a script)
$LoadingBricks_Ownership = 2;
$LoadingBricks_BrickGroup = "BrickGroup_25851"; //Your ID (Brickgroup_yourBLID)
$LoadingBricks_Client = findLocalClient();
$LoadingBricks_ColorMethod = 3;
$LoadingBricks_DirName = missionInfo.saveName;
$LoadingBricks_DoOwnership = false; //Load the save's ownership, if it's false it will load all the bricks in the save of whatever brickgroup is above (which should be your BLID)
$LoadingBricks_FileName = "<save file location>";
$LoadingBricks_PositionOffset = "x y z";
$LoadingBricks_Silent = false;
$LoadingBricks_StartTime = getSimTime();
ServerLoadSaveFile_Start(%file);