- Current PDF viewer only allows for reading PDF files.
- If you work with them annotating is most likely thing you have to use.
- I know there is plugin for that, but it is clunky and detracts from real work: if one wants just to open few PDF files and annotate them it is not possible, that plugin makes you to create files for annotations manually.
Possible Resolution
- Builtin feature for annotating and text boxes
- Possible stylus support for Android and iPadOS