The first item in is the first item out. That's how it's always been. Don't use your postmaster as a storage facility because it's not. In the future, make sure you have plenty of room before starting any activity.
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I know it's first in first out, but since ascendant shards and enhancement Prisms have such a small cap on how much you can carry, there should be either a way to store them safely or have things such as them have priority. This isn't a post to have people tell me "don't use your postmaster as storage", when there's an arbitrary cap on upgrade mats anyways, it's to hopefully get bungie to do something about inventory managent in general, with the postmaster being the focus