Cat Dryness While Breathing

My cat is a 4 month old Siamese that seems to have some sort of crackle either in her throat or nasal way while breathing sometimes. I have mentioned about this to the vet before and they told me that she seems completely healthy. Additionally, when I adopted her about a couple months ago her health check was completely clean but she has been like this since then. She has no issues with breathing otherwise and she is a very active cat. I am concerned because Google gives me results for heart failure. I also have a video that somewhat demonstrates how she sounds but I am unable to post it to the sub. I just want to know if my baby is okay.