You can find the opinions and dissents at this link.
This specific question comes up in the context of a special election, now over, in Pennsylvania, but it’s the same issue that the PA Supreme Court recently declined to opine on in a separate case, saying that the issue was being decided too close to the election. This of course is even closer, and it injects new uncertainty in what is going to happen.
The appeals court ruled that although the state’s election law unambiguously requires that these ballots not be counted, the state Constitution overrides here. (This raises yet another potential independent state legislature theory case that could make it to SCOTUS this election cycle.)
The next fight as I see it is going to be over whether this ruling is going to be put on hold or otherwise dealt with by the PA Supreme Court.