You can mark up text documents by applying annotations.
- Long press any word in the document to display the text annotation options in the navbar.
- Tap and drag the selection handles to select multiple words, lines, and paragraphs.
- To add color to the selected text, tap the Highlight icon.
- Tap the Color icon. Tap a color to highlight the text or tap the Underline icon to add a line beneath the selected text. You can use color to organize and color-code your highlights.