I have a long PDF document I'm trying to get through (with highlighting, etc along the way) little by little. I downloaded Adobe on my tablet (Kindle Fire) and phone (Pixel 3 - Android) so that I can save the PDF to the cloud and work on it across devices. For a few days it worked perfectly. Now, all of a sudden, Adobe on both devices doesn't seem to know how to open it. On the fire, I get an error. On the phone, it loads to 100% then prompts me to pick another app to open it with. I don't really understand why this is - why wouldn't Adobe open the PDF in Adobe? When I go on the cloud reader on a computer, it opens fine within the cloud reader. It is not doing that on a device, though.