We are excited to release PDF annotation feature in this version! Read more about the PDF annotation on our blog Annotating PDF Docs with Diigo - A Tutorial. You can also try the PDF annotation feature directly. If you like the feature, Go professional plan to enjoy the unlimited PDF annotation!
1. PDF annotations
When you open a pdf URL in chrome, a diigo Annotate button will appear in Chrome's default PDF reader.
Click the annotate button, you will see the PDF file is opened in Diigo PDF reader.
2. Delete annotation in the side panel
This feature was suggested by Frank. Thanks!