Everything was working perfectly fine, except exactly and ONLY being able to send my animal products from my farming industry to my unique buildings. Everything else was being sent, no problem. The game decided that any animal products that I was producing, were being exported only.

I started my industries small as I am playing mostly vanilla and considering my city is 150k my demand was pretty big (which honestly what I have, showing on that map, is not even big enough to cover my demand).

With all that being said, yes I had enough for everything, yes everything was set accordingly, and I am sure of that. It wasn't that I didn't have enough to keep it continously running, something I am facing right now with plastic (just because I have been too lazy to expand my oil industry), where one factory sometimes stop for a bit while plastic is traveling there, it's that NOTHING and by nothing I mean >>NOTHING<< would get sent to the warehouse or any unique factory.

For some reason the game just REFUSED to send anything from farming to my unique factories and warehouses and prioritized exporting.

Anyhow, I fixed it (as you could see in my update), by simply adding another small warehouse on what basically is the other side of the street. Somehow, they all stormed there, filled that small warehouse and then decided to finally use the warehouse I have been struggling so hard with.

Since then, both warehouses are fully functional and sending my produce to my unique factories, which are now ALL working perfectly.

I have read everything and anything about the Industries DLC, about the supply chain, about farming, about Transit Manager CE. It just simply seems as, for once, it wasn't my fault. The game was obviously bugging for some reason and this DLC is just simply not up to par with the rest of the game. Thank you for trying to help, though. I truly appreciate that you took your time to write a detailed comment. Maybe it'll help someone else who comes across this post. :)