This event is fired before a file was created within a Resource Storage / Driver. The folder represents the "target folder".
Example: This allows to modify a file or check for an appropriate signature after a file was created in TYPO3.
Method: getFileName() Description: Returns the filename. ReturnType: string
Method: getFolder() Description: Returns the folder where the file should be created. ReturnType: TYPO3CMSCoreResourceFolder