When you are creating reports for a customer, all of your reports will be inside the folder. But you can't separate them (if you have many reports from 2022 and 2023), it would be good if you could create folders inside a folder. This would especially help clients that have multiple campaigns running at once or operate in multiple locations. This means they don't have time to weed through a ton of reports. Subfolders would allow me to organize the reports for them much more efficiently and save time in the long run.