Bluebook Citation Form
I have a Zotero database made in the usual name with the journals' names fully typed out. When I used bluebook form to create citations for a law review article, it did not abbreviate the journal names as Bluebook form requires. I feel this is so fundamental that it's false advertising to claim that the program supports Bluebook citations. I tried updating this with a 2019 update and it made no difference.
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Upgrade Storage
Jurism is much better able to handle all of the complexity and inconsistencies of legal citation than Zotero. If you are doing legal citation, I suggest you use Jurism. See here for more information https://juris-m.github.io/indigobook/