Have you deleted the PDF file from Document Cloud or from your system?
If you have deleted it from the Document Cloud then it won't be possible to recover the file unless you have a backup for it on the system or somewhere else.
Else if you have deleted the file from you system then you can recover it form the Recycle bin (if its there in the Recycle bin).
I did not delete the folder at all. I closed it last night and turned off the computer and the entire Folder is gone today.
Adobe document management is terrible at best. I have the same problem. Why can't they just do like Google Drive. Adobe just loves being complicated to make you stick with their program.