In contrast to chrome some extensions like Join and Pushbullet do not work in opera to exchange data (files, photos, sms ...) between pc and mobilphone? Why?

Push notifications are not possible in Opera, therefore the exchange of data (files, pictures …) between PC and mobile phone via Opera does not work. Therefore I cannot use the App Join (or Pushbullet etc.) at all.
I'm thinking about returning to Chrome, where everything works. Unfortunately.
Is it planned in the near future to enable push notifications in Opera?

I don't want to type the complete passphrase every time I log in to Opera mobile. Is there a way to save the password?