The dryer is very strange. The Sukup Medium has a menu, but the part you are confused about is probably the fact it does not have an industry node. It does have an interactable on the ground, but it's one of those broken exclamation marks, instead of an industry marker. That will let you access the menu to start the corn drying.
Another thing you can do instead of using the Sukup dryer is using the AGI Westeel dryer. That one DOES have an industry node.
Hope this helps.

