New answers tagged textedit
Try with making the file to an Plain text file. It's under the Format tab (not in preferences). Have you taken a look at this? Apple support page
The following procedure worked for me: In TextEdit select all your your text by pressing ⌘ Cmd-A and then go to Edit > Substitutions and uncheck Smart Quotes. Make sure Smart Quotes is not active and it should be solved.
System Prefrences > iCloud > iCloud Drive ( Options ) > uncheck textEdit
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