Could you please elaborate more details about the issue you experienced? Additionally, would you please let us know what type of device, iOS and Acrobat version you are using?
Thank you for your patience.
I am using Ipad IOS 10.3.2 and the acrobat version is Adobe Acrobat Reader 17.06.12. I used to create folder and subfolders but it won't allow it anymore. I don't know if it's the IOS update or the Adobe update. It may have been both.