# package-development


02/24/2023, 1:49 PM
Hi All, I'm trying to develop my first extension, but have some doubts about the assets. 1. I have created Umbraco Package project. There is a special .target file responsible for copying assets to main applicaiton App_Plugins folder. I'm using VS2022 and it is not working. Is it broken, or I'm just missing something? 2. I'm unable to get it to work with manifest provided in C# code. The only way that works for me is package.manifest file 3. How to include additional templates to the package? There are special sections for javascript and css files, but no section for html templates 4. Do I have to reference the CSS file directly in my HTML template or is it automatically provided by Umbraco based on the manifest file?