Cost of shipping

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Hello!
i’m setting up my first dropshipping store and i need some help - my brain is kind of fried already and i cannot find the answers to them...

I’m using Shopify + Oberlo to dropship products from Aliexpress. How do i add the shipping cost that i see on aliexpress on my store? For one product for example, on aliexpress is says that to ship to brazil is 6$. When i see it on my shopify, it just shows $18 and up.

Also, how does it work regarding shipping cost when the costumer buys 2 products from different suppliers/stores?

And finally, when returning an item, which address the costumers will add on the return, mine or the store(aliexpress)?

please heeeelp!
thank you!