IOS Apple text editor- found!
I was puzzled why there is not a text editor from Apple for iOS as there is on the macOS. Well I found it. It’s called Notes!
I needed to save some thing as a .CSV file and I found that if I paste the content from clipboard into notes and then save it to Files, it is apparently a raw text file. Rename it with the extension of your preference and you are in business.
My scenario: I used an AI to do some work that it produced into a comma decimated format that I needed to import into another app on IOS, yet no way to save it as such after fooling around with a few apps and discovering that MS word, Google Docs and Sheets and Excel would not save as.CSV on the mobile versions of their apps, I finally gave Notes a try!
I hope this is helpful for somebody!
iPhone 13 Pro