I have zotero on my main computer but also use zotero on portable firefox on a usb stick for when I am working on other computers. At the moment they are completely separate libraries. However, I want to add the zotero content on my usb stick to the zotero library on my main computer so it is all in the one place. If I copy the folder called zotero from my usb to my computer will it just copy the new files (and so achieve what I want to do) or will it overwrite the zotero library on my main computer. I have seen some posts about third party software, but thought there must be something simpler than that.
Thanks