When you are importing orders that are on an MP you need to do something special in the import file to get the orders to be racked to the conveyor.

Let's say you have an order that is on slot 533 on the conveyor. Normally your import file would look like the picture below, location just set to 533.

In order to get the order to be imported to the conveyor you need to add the $rackId + "MSTO" to the front of the location value. Here's an example of what that looks like, location is set to 3MSTO533. If the location was 0533 you need to remove the leading zeros.

To find the $rackId go into Settings -> Storage and click on the conveyor.

The $rackId will display under the conveyor name.