@dstillman I should've mentioned that this link notes: "Installing on Mac On Mac, ZoteroQuickLook uses macOS's native QuickLook functionality. No additional steps are needed."
The current QuickLook plugin doesn't work in the beta version of Zotero, and probably any future releases after Zotero 5.0.96.2. The discussion is here: https://forums.zotero.org/discussion/comment/386542
"Installing on Mac
On Mac, ZoteroQuickLook uses macOS's native QuickLook functionality. No additional steps are needed."
but the spacebar doesn't work. Any ideas?