how can I undo "unlink Citations"?
I think that might explain my problem...
I can cite only 1 citation it isn't possible to ad 2 different citations ....
I can cite only 1 citation it isn't possible to ad 2 different citations ....
But I'm not entirely clear that's what the problem is you're experiencing. What exactly do you mean by "I can cite only 1 citation it isn't possible to ad 2 different citations"?
https://www.zotero.org/support/reporting_problems#provide_steps_to_reproduce