Editing Resources files at runtime?

Is it possible to edit resources in the resources folder at runtime, like a terrain data?

Thanks!

Not generally because items that are in any folder called Resources get bundled in special bundles during the build such that they are available with the Resources.Load() call and don’t really exist as a file per se. During the runtime you don’t have the project on the file system the way you do in the editor. To operate on assets in the project you probably want to create custom editor scripts to do that.