First of all I want to thank all of you guys you are doing a great job.

second, I know that we can attach a jpg file ,but you will have to leave the reader and open it and when you send it to others it won't open and I know that we can edit pdf to add images ,but sometimes there is no enough space in the page and its so hard to readjust the pdf so it looks normal again, so if we could to comment with a sticky note but we can add in that sticky note a jpg image so that we could write a caption with the image it would be so helpful especially for students of chemistry ,pharmaceutical science and medicine .

looking for hearing from you soon.
regards.