Is there a way to reverse changes done to a txt file in Documents by Readdle?

Solution 1:

Generally, file management applications have the ability to handle any type of file.

From the iCloud drive, for instance, you can make it open the specific file in a specific application by holding your finger on the file icon you desire to open. You then select and by selecting the "More..." option from the menu that will hopefully appear, and then selecting "Share Item... " and finally selecting an application from the list.

Reversing the actions might be undone by simply opening back to the default application it was made to be opened with.

A similar question was answered here, you might need a specific application to handle text files.

Reference: https://discussions.apple.com/thread/7652455