Adobe disappeared from Files App on iPad

Hi Souvik,

Thank you for responding to my comments. Sorry for the delay. I was in a hurry to get my peperwork done so I started trying to "troubleshooting". Sorry I did not make any screenshots before I worked on it over the weekend. Now it is back. I am sharing what I did: 

I checked my other iDevices, the Acrobat folders were all there. I held on to the latest Acrobat updates to my other iDevices but one (iDevice 2). I updated the Acrobat app on iDevice 2. It went through and the Acrobat folder was still there. At this point, I got a sense the missing folder on my iDevice 1 was not caused by app update. I decided to 

1. Rebooted my iDevice1.

2. Checked: Acrobat folder was still missing.

3. Check iOS update for my device: Up to date.

4. Created a .pdf file and saved on my iDevice 1 -> I wanted to know where it would go, hoping to see the folder if I could see my file. /I have set it saved onto my iDevice 1 (not the clouds)./
5. Open .pdf file in Acrobat Reader

6. check Acrobat folder, the Acrobat folder was still missing. 

7. Exit Acrobat Reader

8. rebooted my iDevice 1.

9. Open the .pdf file from Acrobat Reader. 
10. Checked, found the folder. 

I can see the folder now and all my files are still there. Not sure what caused the folder missing (when I needed it).