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oops 😊 sorry, I wasn't clear I meant you to drag and drop your .bib file - feel free to redact anything you think could be personal (eg Documents paths). You might as well try to delete the comments about the QLStephen.qlgenerator. But at least we've confirmed working terminal functionality, eheh 🤪 cheers
dang.. i would open /Applications/Utilities/Terminal.app and copy/paste mdls -name kMDItemContentTypeTree with a space after, then drag and drop the file and hit enter.. Another thing to try in Terminal is qlmanage -d1 -p w/ space, drag & drop and enter to see if it says anything about what is happening..
hm, did you also do the last installation instruction "• Execute the command qlmanage -r in the Terminal - or restart the machine" from your link? I also see whomwah.github.io/qlstephen and github.com/whomwah/qlstephen seem to link different versions, and checking here i see i'm currently using version 1.3.1 (where i only find 1.3 on github.com and don't know where i got mine), which version did you install?