I accessed a PDF document online. I supposed I could fill in the fields and saved it online but I couldn’t. I downloaded it and tried it offline again I couldn’t either.
I check the Document Properties -> Security. I do see “Filling of form fields: Allowed”. What could be wrong. I do not think I need the Adobe professional application to do the job. I remember I could fill in the fields on one of the PDF forms I had before while having only Adobe reader installed.