Copy events between project doesn't always copy assets

I get a .fspackage file from our remote sfx team and I want to copy any new events into the main FMOD project. It works fine the first time I copy the event, but later on if an asset (.wav) changes FMOD doesn’t seem to copy the new asset over. I have to deleted the original event and then delete unused assets and then when I copy the new event over, it works as expected.

Am I doing something wrong? Is this functioning as intended? Should this work and isn’t?