Ok, I can help you with that. When clothing or plastic bags get stuck, it's usually where there is an elbow in the tubing on it's way to the dirt chamber. Luckily that vacuum has a short distance from the hose to the chamber.
Remove the hose, and feel for suction where the hose connects. This will tell us if it's stuck in the hose, or if it's in the vacuum.
If it's in the hose, you can carefully reverse the hose, to try to suck the item back through the hose. You can also use a metal coat hanger to feed through the hose until it comes out the other end. Your best bet is to go from the end that attaches to the vacuum, and out the suction end.
If you find that it isn't in the tube, use the same coat hanger, and make a little hook. Feed it gently into the vacuum, and hook the item with the coat hanger. It should pull right out. Remove the dirt chamber so you can see where the tube feeds into it. You should be able to run the coat hanger all the way into the chamber.
Let me know if you cannot get it out. That item you showed me would definitely cause a lack of suction.