2. There is an annotation tool in the annotation and label. Click the labeling tool, and there is a labeling style palette in the labeling tool to modify some labeling styles.
3. Click the Annotation Styles palette. There are many styles, fill colors, line colors, borders and widths, which can be modified according to the needs of friends.
4. After setting, you can drag out such a comment box in the file, and you can write words in the comment box.
5. After writing comments, you can click Comments in the menu bar, select Show Comments, and then select Show All Comments to display all comments in the file.
6. If you need to add comments to a PDF file, you need to use a PDF editor. You can Baidu it.