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')