Can't add files to a subfolder

I have a number of files in my subfolder (all of them articles) and it seems like I can't add any more files to it. I removed a file from it and readded it by dragging, and it worked, but I couldn't add a new file. Is it a bug or is it something I'm doing wrong? I'm pretty experienced with Zotero and never experienced anything like this before.
  • Could you say exactly what you're doing? Are you talking about dragging items to a collection from your library root? Or something else?

    The most likely reason you wouldn't be able to drag something is the item already exists in the collection.
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