I was using tray 3 to print folded and stapled booklets, but it stopped working. I think it has to do with a little symbol under Paper Setting. Beside Tray 3 (and tray 2, booklets used to but won't work after this showed up) there's a little symbol that's like a square with a "1" in it and the bottom right corner folded. I'm not sure what that symbol is but I think its why it stopped working... Any help would be greatly appreciated. Reddit link below has an image of the screen:
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