I have a Grand Tumulus ready and waiting for goods, but it's not getting them. So far all its gotten is all the Jade it needs and a small amount of Lacquerware. That's it. Nothing else is being delivered there even though I have plenty of all the other items. What do I need to do to get my deliverymen to bring the goods there?

sometimes, the npc are lazy shets. have a storage right next to it and see how that goes. might be a road connection issue somewhere. it can be something really stupid stopping it. like not having enough workers so they wont walk more then 1 foot to get goods.

Well it finally got the goods after about another hour of gameplay. I don't know why because I had them that whole time. Man I hope I don't have to build another one of those any time soon.

if the goods were really far away and all roads are connected they might have gone some stupid long path to get there but were getting killed off.

if you set the storage yards to "get" they will go off road to get the supplies if theres no connection so this could be used to cheese quicker builds.

You need to send it to the correct entrance of the tumulus.

Which one is the "correct" one?

I think I finally figured it out. I believe you have to get at least four of the first items on the list in a nearby warehouse. Make sure it is not being stockpiled. It's also possible that you have to have a road connected to two of the four entry points, but I'm less certain about this. Once the first load of 4 items is delivered it will continue to deliver that good, and also start delivering the second set of goods on the list (In my case I first had to provide Lacquerware, then Silk). This progress through to the last item on the list. Try this and see if it helps.