I feel like I’m missing something because nobody has remarked on it, but that tool you’ve selected isn’t the text highlighter, it’s the highlighter pen, and as far as I’m aware that highlighter pens aren’t picked up as an annotation in DT (or in any PDF app that supports annotations)?
The text highlighting tool is this one:
The highlighter pen is for drawing freeform highlights on a page. It creates a vector layer on the PDF, not an annotation.
