Offline app using internet data

I am making a totally offline application with 3 extensions: In app pdf viewer, colintree list view and color gradient.
there is no ad.
Why once installed does it still use internet data ??

Does it still work when you turn the wifi and mobile data off?

Yes whithout any problem
All my pdf documents, image for buttons or any other is saved in the application.

Share your blocks inorder to understand your query & what you have tried

@niko pdf extension mey online pdf viewer then it use internet data

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So why does pdf viewer work without internet?
To verify I made an application with just a button and a map which becomes visible or invisible and the application consumes bytes … it’s really small but consumes
A button and a card doesn’t use the internet so I don’t understand