Translation:My brother pastes the text in the document.
Does this mean "My brother pastes the text into the document"? We wouldn't say "on" in my part of the US. "Into" is marked incorrect.
That alternative has been added, thanks. Note that for the reverse in French you must use "sur."
No, in this context "sur" doesn't mean "about." To "colle le texte" means to paste the text in or on a document.