PDF comment: need Insert Text at Cursor tool
People who are reviewing now only can add a sticky note, , highlight text, underline text (and add a comment), strikeout text and draw. Adding text. The regular Comment toolbar also contains the Insert Text at Cursor tool. This must be added to the review features when documents are sent for review via the new Send for Review feature.
Kristin Salaway commented
Also supported/voted it here for Document Cloud Reviews
Fred Bartrom commented
Neded in the Share for Review using Creative Cloud.