In your release pipeline, do you actually build/compile the package files? Just to make sure we're not missing anything. This is an example of a video player package. There is not much more to it: - Built files are in wwwroot/App_Plugins/VideoPlayer - Project is a razor class library (project file): - In the project file (in a property group) I have these two settings: . / ANd I really think that's it https://cdn.discordapp.com/attachments/882984798719729704/1483784330701705328/image.png?ex=69bbd957&is=69ba87d7&hm=d13b40405383e6c26dae8292527a16267f3a673392336feddd1633249105d360&