On iOS, I have a file called "key". I needed to copy the content of this file to the clipboard. Dropbox wouldn't open or preview the file as it was. So I renamed it to "key.txt". Now I was able to open the file and copy its contents.
But renaming the file back was a problem. If I renamed it to "key", dropbox added the extension, trying to rename it to "key.txt", which gave an error for duplicate file.
How can I rename "key.txt" to "key" on iOS?