Who knows how to attach cv in txt format?

First "you" need to create and edit it using a text-editor (Notepad++) and save it by extension as ".txt"

Then simply copy-paste in the text-cv column on the required website.

The necessary action from your side is "format" your text-cv using "white-space" and "- " or "o -" for bullets. All this is to be done in the text-editor (best one is Notepad++).

-YD