Description of my problem: In my company, we share pdfs through an internal network and provide locations for others to find the pdfs. When I create a design (eg. in Photoshop, Indesign, etc) and export it to a pdf, I share the location of the pdf to our marketing team to review. That means 3 - 7 people at a time are opening and viewing the pdf and some give me feedback via email on what changes to make. That's when I go back to the design and make updates to it based on the feedback. When I try to export the pdf again to update the original one, it gives me that error message, because obviously 3 - 7 people have it open on their computer. I basically have to go around the office and become a fully-fledged detective to solve the mystery of who still has it open. When I find them, I have to ask them to close that pdf so that i can finally update it. This is so counter-productive and wastes hours of time. Why is it that we can update a jpeg when its open on other computers but not a pdf? Does not make sense to me.