Offline app using internet data

[niko]

Hello
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 ??

[deanart2012 (Dean Artis)]

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

[niko]

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

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[vikaskumar808431 (Vikas Kumar)]

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

[niko]

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