How do I save PDF documents in Adobe Reader on my iPad?

Question

I add files to my Adobe Reader on my iPad from Acrobat.com. They show up as recent and they disappear after a while.  Contrary to what I was told on this site earlier (items don't disappear in recents unless it is to full), my documents/files do disappear.  I was working on a document earlier and now 3 hours later ii's gone. I don't always have access to wireless enternet when I need to open the documents.  Also,when I download (or what ever it's called when you open them up on an iPad), the notes and highlights that I did on the document have disappeared. 

Answer 1

I apologize for misunderstanding your comment. It's easy to misunderstand what we read here and often I find that if I just ask more questions people are frustrated so I erred on the side of providing information rather than witholding it and asking more questions. If you are frustrated I apologize, but being abusive doesn't help any of us =). Everyone in these forums who is trying to help is a volunteer. I happen to be paid by Adobe to build the Reader but I volunteer in the forums during my lunch hour or extending my day to answer questions. I'm doing my best.
My understanding of our cache is limited, but it looks to me like our current Acrobat.com cache is 100 megabytes. We will start pushing files out of the cache from the least recently used forward until the cache size is less than 100MB. We don't currently have a way to explicitly mark Acrobat.com files to be saved locally. One way to achieve this would be to open the file from Adobe Reader into another app and then open it again in Adobe Reader which will place it in your Documents. Alternatively, you can use iTunes to add the files to your Documents from your Desktop after downloading them from Acrobat.com. I recognize that this is a little strange and will result in 2 copies of the document (one in the Acrobat.com cache and one in Documents) but I wanted to provide the option. I've emailed another engineer to verify my understanding of the cache and to see if she can provide a better workaround.