Hi @Anonymous,
If you create folders using this method, you can dynamically define the folder name, as shown by the red line in the image. Similarly, you can define the names of subfolders in the same way.

Since the method you used to create folder before need to create a new file, if you use the "When a file is created", it will trigger the flow every time. Realistically, the structure of your stream will trigger multiple times even if you add a condition to determine whether it is a folder or not.
As the problem that you met shown as your screenshot, you could share your flow configuration to us.
Best Regards,
Community Support Team _ Lin Tu
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