Annotating Pdfs also works fine pre-beta with an external Pdf-Viewer that is capable of hilighting and adding comments, like for example Foxit or Pdf-Annotaor.

Annotating Pdfs also works fine pre-beta with an external Pdf-Viewer that is capable of hilighting and adding comments, like for example Foxit or Pdf-Annotaor. Simply double click to open the Pdf in that viewer (has to be default app for file type), annotate, save file and back in Ztero it is possible to extract the annotations into notes with the Zotfile plugin.