Hi, I downloaded and activated the Instasend plugin. I began noticing some problems inside a post I was working on. For example, when I clicked on an image, I could not dray resize it. I also could not enter a keyword in my Yoast SEO. The page also jumped around when I tried to scroll. When I made edits, the post would not save in draft update. I deactivated the plugin and everything worked as it should. I reactivated it and the problems came back.
Hope this helps. It is a very cool plugin and hope that you can get it working for me. Curious if anyone else had the problem.