In my currency vault, it says I have 0 crystals though I have like 70 in my inventory. There's no way to deposit them from the currency page, and if I quick stock into my vault they just go into regular storage. How do I add them to my crystal currency?

Just go to the fragmentizer and there will be the option "Turn in Crystals" in the top

Oh, I feel so stupid. Haha. Thank you!