Documentation for Citation Key Formula?

[tob1askastl]

Hey! I'm very new to Zotero + Better BibTeX, and I wanted to test adding citations and exporting the keys to a literature.bib-file.

I'm having troubles defining a correct citation key formula - and I couldn't find a proper documentation of what's possible to define. Is there one?

I'm trying "auth.lower + shorttitle(3, 5) + year", so it takes the first 5 letters of the first three words, but it's not working - it shows the whole first 3 words. Any ideas on this one?

[retorquere]

https://retorque.re/zotero-better-bibtex/citing/index.html