Suppress Optimization
When your extension is shared or deployed, its resources are optimized to reduce load times and network traffic. Optimization is recommended to improve your App UI's performance before it's shared with others, but at times you may need to disable optimization, say to troubleshoot file access issues that occur because of optimizing your extension.
Optimization minifies application stylesheets, HTML, and JSON files, and creates RequireJS bundles in the embedded build server that prepares your extension to be shared or deployed. If you don't want these resources to be optimized, you can turn off optimization before sharing or deploying your extension.
To disable application optimization:
To re-enable optimization, deselect Suppress optimization in the Settings editor. Optimization automatically takes effect the next time your extension is shared or deployed. To explicitly specify the resources you want to include and exclude in the optimized resources bundle, see Customize Optimization.