FC - Can't save custom static objects in level

[Damascus]

I've moved a wall from Machine for Pigs over into my custom stories folder, but for some reason, I can't get it to save in the level.

For example, I am trying to use "streets_buildings_type3_groundfloor_door_open.dae". I have that, and the associated .MSH file, as well as all the associated .MAT files:
streets_generic_buildings_brick_stock
streets_generic_buildings_ground
streets_generic_buildings_plaster
streets_generic_buildings_attachments
streets_generic_stone_arch
streets_generic_buildings_windows
And all THEIR associated .DDS files. I have all of that moved into my Full Convesion's folder.

I the Level Editor, I put in a random static object and change its path to the custom wall. It loads in the Level Editor just fine, and I can see it and everything. But when I close the Level Editor and then open it up and reload my map, it's gone, and it says "file index out of bounds."

Can anyone help me with this?