Update: I am approved! I brought all my passports to my interview and was very upfront with the officers about having multiple citizenship. They were able to add them to my application there and didn't really seem concerned that they weren't on my original application. That said, they did want to make sure they had the information from all of my passports on file and said I need to make sure to keep my account updated if I ever renew one of the passports. But all in all, it was a very easy process.