I have the same problem. Tried "open in new tab" but no luck. I want to use the YouTube app so I can easily cast to my smart TV. Other links don't open in their default apps either.
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RE: Links do not open in external appsOpera for Android
@hhz Thanks for your reply. How did you get that popout menu? I have Opera version 51.3.2461.138727 last updated 26/04/2019 on my Android Galaxy S7 and I don't see that. Is this a feature in an update not yet released for all devices?
Also, it looks like that menu comes from long-tapping the address bar. Do you also get that from long-tapping links in a page?