OfficeSuite apps for android suspicious behavior.

I have several apps for editing office applications in my android phone such as from microsoft office and polaris. For few weeks later I'm starting to use OfficeSuite apps from MobiSystems Inc heavily and I feel comfortable with it.

What surprise me when I'm trying to save the document to internal memory of my phone, error notification pop-up saying that the Internet connection was required to complete the task. I just want to save into my internal memory, why the apps want Internet connection? After I enabled my WiFi then the OfficeSuite able to save my file to the internal phone memory.

Do they want to upload our file to their server without our consent? I still thinking why internet connection are required even though I clearly state the path to save is into the phone memory.

Now I'm have some suspicious on you, OfficeSuite.


Additional info:
Im using android Ver 6.0.1
Galaxy S7
OfficeSuite free version, Version  8.7.5272 from Mobisystems, Inc