Editing a listening document lets you remove any text you don't want to hear, fix words that didn't render correctly, or add additional text that wasn't included.
Open the listening document you'd like to edit
In the listening screen, tap the kebab (3 dots) icon in the upper right-hand corner
Tap Edit text for the context
Edit the document however you like, then tap Save.
Note: The feature is available on PDF files only.