We are currently on Unlayer version 1.101.0, and in this, and all previous versions we've used, we were able to manually trigger update of Unlayer email preview. What is our use case: User is able to write templating language When user goes to preview, they are able to replace the placeholders and TL with their custom values we have in our custom sidebar This updates should trigger HTML preview to update (more details in second attached image) It seems that the logic we had for making this work broke sometime after 1.101.0 version. Using 1.287.0 this doesn't work. In my opinion, there are two options to resolve this: Either provide us with new callback for updating preview Fixing the original issue where "done" function reference is lost and we cannot trigger update by saving the reference of this function. Looking forward to your updates.