The developer folder is a powerful tool in Unreal Engine that allows you to separate experimental work in your project to avoid errors. Developers often break the project/ build by trying to experiment with new content or perform large refactors within the main content folders. Developers folders give you a safe place to do just that without breaking the entire Unreal project in the process. In this video I go in depth on how to enable and setup developer folders in Unreal Engine 5 as well as the best practices for using the dev folder.
https://dev.epicgames.com/community/learning/tutorials/rP4n/you-should-be-using-developer-folders-in-unreal-engine-5
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