I wanted to confirm which of the options would be correct here. My brain can find reasoning for both.
Reason for "were":
- The sentence could be rephrased as "Orion data and Crew Dragon data were added.", in which I'd use were since there are two names ("Orion data" and "Crew Dragon data").
Reason for "was":
- I may be wrong in this, but I think that "Orion and Crew Dragon" can work as a modifier to "data". In this case I'd use "was", since the subject would be "data".
I think both of them might be valid choices, but I'd like to confirm.