Unable to locate app.data in Android

Team.

I've recently installed a training app on my Android (6.0.1). App itself is a free one, but I have a registered account to download offline training videos using this app.

While I could see the download is completed and app-data shows up ~1GB, but I couldn't locate the actual data file. It's a rooted phone, so tried searching the files using various 'file explorer' app; still I couldn't locate the app-data files.

Is there any secret data-store this app is writing on my SD card, if so how can I find the location ?

Thanks for inputs !