content: This is a really good app for reading PDFs. My rating is based on what it claims to do vs what it actually does. In the Play Store it makes the claim to edit and combine PDF files. However that requires an upgrade andnot even to a simple purchase plan but to a subscription service. 10 a month is fine for businesses that are going to use Acrobat all the time  and I own the high end Acrobat for my desktop computer  but I just want to combine a few files on my tablet.