Can't share files between laptop's app and mobile's app

Hi there!!! I downloaded the app on my laptop (windows) and on my phone (android) and connected both with the same Google account.

I was able to download a video from Youtube on my laptop .... and I am able to see my laptop on my mobile app (under devices) ... but that's where it ends!

I cannot download anything on my mobile app from internet (there's no bar to paste a link) or from my laptop's app. It only scans my own mobile memory and find all the videos on my photo gallery!

How can I get both apps to share their files?