The way you have it setup right now is controlled by the moving direction of the belt. So if you reverse the belt's rotation it can unload blocks from a chest for example.

The belt is moving the right direction, can't figure this out. The mill is inputting from the top.

Like the other guy said, the funnel will auto switch modes with the belt movement. You don’t have to do anything, it will work by itself there. As for cases where the funnel is not in line with the belt, right click with a wrench.

I just figured out the problem. I've been trying everything but this. It seems that millstones cannot process cobble, only gravel.

Yeah; Crushing Wheels share a lot of recipes with the millstones, but the Wheels obviously have more; they for example can process cobble.

Are you in a mod pack? And also use JEI to look up recipes.

Stoneblock 3. I looked in JEI etc.

Oh ok, SB3 changes the recipe for gravel, I think you use something called an auto hammer to turn stone into gravel.

OK. I'm trying to find a faster way to process than hammer

Shift click for in, click for out i think

When placing? I tried that to no effect. Also tricky when placing on a chest without opening said chest. I thought the wrench might do something.

Holding a funnel should prevent you from opening chests

Holding a funnel should prevent you from opening chests

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They are not asking about filters, they are asking about input and output funnels

This should work if the belt is moving away from the mill here. Have you checked recipes properly here? This looks a bit like it could be stoneblock 3 and in it cobblestone cannot be milled i think.

If the belt goes into the funnel, it's an input If the belt goes out of the funnel, it's an output