I created a text file on the Dropbox app on my Android device. After saving it I can no longer edit the file and it pops up with a message saying "please download an app that can open this file." So, I downloaded Dropbox Paper app, Adobe Acrobat Reader, and Word. Nether work. None let me open the file. It's like why would you let someone create a text file on the app and then not provide the tools necessary to open it and edit it?! What app can I download that will let me open the file.