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I am trying to fill out this form but it doesn't allow me to input any data. It doesn't even react to the Tab key. I looked at the document properties and it says that "Filling of Form" was allowed. I also looked at the answer for the other question like this, "How to input data on an existing PDF form," but that didn't really help me. I've had this problem before with other pdf documents. Can you assist me? Thanks!