iAnnotate allows you to customize how you send documents. Here we'll explain how to send annotated pages only.
From document view, tap the share icon in the top right. A menu will appear giving options to choose document type and advanced sharing features. To choose annotated pages, tap "advanced", then, tap "annotated pages only" so that a check appears. Back navigate to the previous menu options. You can change the document type or choose other options if necessary: flattening will make the annotations permanent (i.e. not editable) and annotated will allow the annotations to be editable by the recipient.
Once you have all the settings selected tap share and choose your sharing method.