Some reasons why a shared file would not be generated when a File Share action is processed:
The processed action resulted in a “no data exists” case such that the view results did not contain any data. A shared file will only be created if the view results contain data. If the view results do not contain any data, then a shared file will not be created. See also What Does “No Data Exists” Mean?.
The parameters specified while scheduling the action to be processed may be incorrect or incomplete. For example, you may have specified an incorrect or invalid Action ID, you may have used spaces in a specified file share folder and forgotten to enclose the /FileShareFile parameter/value in double quotes, or you may have used a space before or after the equal sign in the /ViewActionId parameter. Another possibility is that you specified a file share folder that the Action Processing Account does not have read/write access to and therefore the file could not be written to the specified folder. See also Scheduled Actions Overview, Parameters, and Examples.