Thanks for posting this topic. I can provide some follow-ups from the mobile side.
Flow confirmation issue: There is a bug in the Desktop version. Current workaround is to follow the steps below
(Desktop) Load www.opera.com/connect (Mobile) Scan the generated QR codeSynchronization Speed Dial etc. not listed issue:
Speed Dials and Open tabs are synchronized independently unlike Bookmarks. You can find them from the computer/mobile icon next to the "+" Speed Dial. The open tabs can be found by a similar steps, but you go to the tab gallery instead.
As we do not have Pinboards in Mobile, we don't have any sync entry for that.
Flow always need to be enabled manually.