Updating .txt files on PC doesn't update it on the Android app unless the file is renamed

I'm experiencing the exactly same problem. To add a workaround, we can see the updated .txt file by intentionally making a conflict: add some change (such as just a new line) to the file that looks outdated. Then the app renames the file updated on Android to mark it as "conflicted", and you'll see the right version with the original name. Of course you can remove the conflicted file.