One of them says sealer and another one adds “vacuum” to the ad - confusing.
Don’t just look at the product website. Do a search on ‘Foodsaver reviews’.
I’ve often found that the reviewers you find give even better instructions/troubleshooting than the product website does.
Foodsaver has “dam” bags for that. See youtube video.
They also mention tbe paper towel trick and admit it doesn’t achieve full vacuum. At the same time their dam bag doesn’t. always work. Guessing that moisture quantity is the key factor.