The other week I had to edit a PDF file for my school, it was going well but when I sent it i got a call saying the blanks on the pdf file was empty even though when I opened the file on firefox they were there. I checked gmail and i saw that the edits i made, especially the text was gone, just a few remained for some reason. Today I edited another pdf file and when I opened it on chrome to see if the problem was still there, it was. More than half of the edits i made on the file were gone. I don't understand why only some parts stay but the rest disappears, is there a way to fix this?