Is your cloud storage "Adobe Document Cloud"?
You can sign in from the Acrobat Reader app on your iPad/iPhone or Android tablet/phone to access the documents in the Document Cloud.
Here's the Help document for Acrobat Reader for iPhone and iPad.
You can also access files in other cloud storage services (e.g. Dropbox, iCloud, Google Drive, Microsoft OneDrive, Box) from Acrobat Reader for iPhone and iPad.
Please let us know if you have additional questions.