You can read PDF articles you have in your Zotero library directly in your Zotero window. You can do the following in any editable PDF:

• Highlight sections of text (in a range of colors).
• Underline text.
• Add a note.
• Write text annotations on the margins.
• Draw on the document.
• Put a box around a paragraph.

The toolbar with the annotation features will appear at the top of the PDF reader.

You can then extract the highlighted sections from the PDF as a separate note in Zotero. To do this, simply right-click on the PDF, and select "Add note from annotations."

You can capture your own thoughts on the articles you have saved. Click on the "Notes" icon in the right-hand pane to add your own note.