Hi,
Can you please verify the model number? There is no mention of a V4980 model on the Foodsaver website.
Here is a link to the user manual for a Foodsaver V4800 series vacuum system. On p.11 it shows how to use the handheld sealer accessory.
https://www.foodsaver.com/on/demandware.static/-/Sites-food-saver-Library/default/dwa0e4705c/documents/instruction-manuals/204P_FSV4800_BBB_IB_MECH_r4.pdf