I'm trying to add annotations/highlights to a PDF using the Document Viewer (Evince) in Ubuntu 16.04. When I add a text annotation, the annotation box comes up for me to type in but when I close it there's no way to re-open it. It's in the annotations pane but I can't see it (or the icon for it, which is supposed to be there) in the document. Highlight annotations don't work at all.
Is it just that the Document Viewer doesn't support annotations/highlights for scanned documents?
If so, and the feature hasn't been added in 3.20 or is planned to be added in 3.22, then tell me and I will file a bug report for the misleading appearance of the annotation box/the failure to grey out the options for scanned documents.