This happened to me just today. I guess there must be something wrong either with the beta2 of IOS12 or the compatibility of the Adobe App. I can even open new documents and save them to the app, but when I go back to files there is nothing. DO NOT UNINSTALL AND THEN INSTALL THE APP!! It just deletes the documents (you obviously can’t see on the phone) in Local but it does not fix the issue. Hope they will get this fixed.
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