The mill takes raw materials from the warehouse (Cities: Skylines)

Actually this is the crux of the problem. Built area of woodworking industry, set up a separate building with trees (beech), sawmill and warehouse. But all the logs in this area are, even at the plantation, go directly to the warehouse or for export. A raw material for the sawmill always goes with import and with only two trucks, from the raw material is never enough. What to do?