Why is secure folder using data in the background?

[Doctrdope]

I thought it's supposed to be in-phone folder locking, why is it using data in the background, is this uploading stuff to any samsung server? I've samsung cloud turned off, moreover this is private stuff. What's your opinion on this?

Users, Check yours under data usage - wifi & tell me about this.

[Samsung_OneUi]

Showing no background data in your post. If it uses background data then it shows like this. See this screen shot. Blue line indicates the background data.

[Doctrdope]

Check this out.

[Samsung_OneUi]

Put it in restricted as i put. Send the screen shots which apps are installed in your secure folder?