Do you use a PC or a Mac?
I use a samsung tablet?
[topic moved to Android subforum]
[discussion moved to the new Reader/Acrobat DC for mobile forum]
All the folders you created are still present on your device. Would you let us know if the following documents help you:
- How to open PDFs on Adobe Acrobat DC on Android
- How to add Comments to your PDFs in Adobe Acrobat DC on Android
Some Samsung devices(running Android Lollipop) have issues in accessing the local file listing. Could you please download a third party file manager such as ES Explorer or And Explorer from the Play Store and try the steps? If you do not want to download a file manager, you can go to 'Settings'--> 'Application Manager' --> 'All Applications' -->'Dropbox' -->'Turn Off'. After following these steps, you will see only the local file listing on your device on clicking on the floating action button (red dot).
Please let us know if you still observe any issues.