Did you look at your drop box account to see if the files were saved there?
They are or were there, but I need the editing and folder tools that were in my Adobe Acrobat account that have disappeared. I have a lot of other documents in Acrobat, not Dropbox, that I would need time I don't have to figure out how to save somewhere else so I could delete and reinstall Acrobat.
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Click on "View => Tools => <select tool bar> => Open".
You can use "Save as .." and chose your location to save the PDF.
You can backup the documents with iTunes.