A component for uploading images and/or files in bulk into `DataObject` managed by the `GridField`.
## Usage 1
Simplest usage, add the component to your `GridFieldConfig` as below. The component will find the first `Image` or `File` has_one relation to use on the managed `DataObject`.
$config->addComponent(new GridFieldBulkUpload());
## Usage 2
You can specify which `Image` or `File` field to use.
$fileRelationName (string, optional): The name of the `Image` or `File` has_one field to use (If your relation is set has 'MyImage' => 'Image', the parameter should be 'MyImage')
The underlying `UploadField` can be configured via a set of APIs:
*`setUfConfig($reference, $value)` is used to set an `UploadField::$ufConfig` settings
*`setUfSetup($function, $param)` is used to pass function calls on to the `UploadField` itself
*`setUfValidatorSetup($function, $param)` is used to pass function calls on to the `UploadField``Validator` itself
For example, to set the upload folder, which is set by calling `setFolderName` on the `UploadField`, and setting the upload method as sequential, you would use the following:
Please see the [`UploadField` api](http://api.silverstripe.org/master/class-UploadField.html) and the [`Upload` api](http://api.silverstripe.org/master/class-Upload.html) for more info.