Thank you for your quick response, jasotastic81.
Unfortunately, I don't know whether it had been imported. The file was passed down to me. I know for a fact that it's not an image, because I can select it in Acrobat. I can just open the file in LC, it never asks me to import it. One thing that pops up when I open the PDF is "Some usage rights have been applied to the form you want to open. Opening the form will remove the usage rights. Do you want to continue?"