Another alternative is to pick up another panel from a wreckers yard. I notice you have the black interior which is the most common I believe. Usually when that material lets go it shrinks a bit so you may not be able to reattach it properly. Good luck to you anyway and please let us know how you make out.
I have a 2014 convertible. I bought thru dealer auction from FL. as is, where is. Same problem on the passenger door. Local detailer pulled it up as tight as he could and glued. Not as ugly as it was. Unless you look at it closely not noticeable. Was told it is from a lot of hot direct sunlight. Makes sense as a FL car. Thought about the junk yard deal. May look into that.
I had this happen on my 2014 200 convertible hard top, passenger door just as the 3 year warranty was expiring. Door panel was replaced under warranty. I live in Western PA, so am definitely not exposed to a lot of sunlight.