According to your documentation drag and drop ranking is only allowed if a single ORDER BY of Rank is used in your scrum planning board filter.

Would like to sort by Epic Colour as well:

• ... ORDER BY "Epic Colour" ASC, Rank ASC

and this sorting works (yeah!). But of course, this breaks the Drag and Drop ranking ability:

• "Ranking is disabled, as the Filter Query for this board is not ordered by Rank. Please check your filter configuration."

Yes - I understand that only one ORDER BY is currently supported:
https://confluence.atlassian.com/x/GhPzE

But I am requesting ability to use multiple ORDER BYs in Scrum Planning filter view, if Rank is still last.

Thanks!
Rick