@leocg if that's the case, where do I request a feature?

I use Opera GX as my main browser. Ever since I started using it on mobile, I've had the issue of bookmarks and history not being able to sync between PC and mobile, I'm wondering why that is.

Whenever I open a Google Doc, Slide, Sheet, etc., the tab fails to load with the "unknown protocol" message and the Doc loads in a new window. How do I fix this?

@ViAik doesn't work.