Your text annotation simply does not work. It is frustrating to want to buy a software like this and you can't even demo all the features. This is the hardest pdf framework I have ever tried where you have to do so much in code instead of having a clean working API.
You should be able to provide a demo with all the features in working conditions.
You should be able to provide clean Apis
You should be able to provide sample codes so that one doesn't have much coding to do just to add features that were supposed to be provided.
I have spent hours evaluating this and I am still unsure if I am going to be satisfied with the product because I can't even see it working as I expect and I have to invest time in coding just to see if it is going to work.
to check the note annot, you have to long press the pdf text, then highlight the part that you want to note, release the finger and check the note option (TA: text annot).
In the video, you are trying to show the pdf index, but the demo pdf doesn't have one.