Inserting items into Writing Desk

Inserting items into Writing Desk - Woman in White Tank Top Writing on White Paper

I'm not sure how Forge handles the relation between block side and inventory slots, but I would like to auto-refill my Writing Desk, that is, insert paper and ink vials and retrieve empty vials. However, it doesn't matter what side (of the 10 available, two blocks wide), I can only insert the paper. I would like to know what is the side connected to the ink vials inventory slot for this block, and also, if possible, how can I easily determine that for any given block. Finally if there is no association, is there any other way to auto refill my desk?






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