buy togather in one products ?

when i add buy together in one product why the block not showing in the second product ?

for example if i put in T-shirt )product) page buy together with another shirt , then i log to the second shirt page i cant see buy together there !!

any idea ?? i dont wanna do it manually !!

Because the “buy together” addon is related to a single product. You would need to do the inverse on the 2nd product. It's just the way it was implemented. It would have been nicer to have a block of products visible from all the individual products. However, I can certainly see where you might want to offer a bundle for one product (slow mover) and not the others.