Converting files now involves uploading and downloading

I was doing what I always do, taking an Illustrator file and opening it in acrobat to double check content. For some reason Acrobat decided to upload and convert the file and then download. Not sure what this is about but it needs to stop. It is now hung up downloading and making little or no progress. Can someone tell me what is now different and how to change it back to the way it was when I could open a file without it uploading, converting, and downloading my file?