How to make factories work in cities skylines?
Solution 1:
I think your question might be answered by this link. It is a more complex answer, but might be worth reading. What seems very important is to have raw and processed storage spaces, short travel routes for the industry trucks and also intersections, or U-turns nearby facilities. Also, storage filling is also tricky, while for example a storage building set to fill might import all it's resources. This, and other aspects are addressed in the above link, in more detail.