Bulk shipping via buy shipping on seller central

hi
I am new to “buy shipping” so need help.

I used to use click n drop by royal mail with royal mail account but have to move due to low valid tacking rate issues.

I have attached my royal mail account to amazon to get my prices and when I try to ship with the bulk shipping option (buy 100 labels at once) using amazon’s buy shipping option I only get royal mail shipping labels but no packing list/ invoice.
however, if I use the ‘buy shipping’ button next to my orders it gives me options to print both shipping label and picklist/invoice together.

can I get that option in bulk shipping?

i am using zebra gk42d.

ps my amazon print connect doesn’t work as using macOS