I am unable to upgrade weapons to a higher power level directly from the vault. Instead you have to move both weapons to your character and upgrade there. Considerable waste of time. This exact issue occurred last year and wasn't fixed until the new year. Let's not repeat this year.
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Edited by AubsTheBelieber: 12/18/2022 3:01:48 PMThis issue is lesser the size of an ant with zero people worried about it. It probably costs you more time to write this post and read the response than to pull a weapon from the vault to upgrade it.