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# UpdateSharedFile

Updates a file in the shared file directory for the Controller that you specify by using the `ControllerUUID` parameter.

## Required Parameters

The following action parameters are required.

Parameter | Description
--- | ---
ControllerUUID | The UUID of the Controller that you want to run the action on.
FileName | The name of the file to update.
Operation | The type of operation to perform on the file.

You must set at least one of the following parameters.

Parameter | Description
--- | ---
FileData | Data encoded as `multipart/form-data` that is sent as part of the request, containing the new file to use. This parameter is required if you set Operation to `create` or `update`.
OldCheckSum | The checksum of the old configuration file. This parameter is required if you set Operation to `update` or `delete`.

## Comments

You can also submit this action from individual Controller servers. For more information, refer to the Controller Reference.

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