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In order to be able to attach files for different locales to models, we can extend the `System\Models\File` Model as shown below. Using an AttachOne or AttachMany relation and adding the `"translatable" => true` option to the relation, you could then add multiple files and specify their locale using the added field. Use the code below in your Plugin's boot method:

```
use System\Models\File as FileModel;

...

public function boot()
{
	\Winter\Storm\Database\Model::extend(function ($model) {
		if ($model->attachOne) {
			foreach ($model->{'attachOne'} as $relationName => $options) {
				if ($options[0] === 'System\Models\File' && isset($options['translatable']) && !isset($model->attachMany[$relationName])) {
					$model->attachMany = array_merge ($model->attachMany, [$relationName => $options]);
					unset($model->attachOne[$relationName]);
				}
			}
		}
	});
	
	\Event::listen('backend.form.extendFields', function ($widget) {
		if ($widget->model instanceof FileModel) {
			$widget->addFields([
				'locale' => [
					'label'   => 'Locale',
					'type'    => 'dropdown',
				],
			]);
		}
	});

FileModel::extend(function ($model) {
		$model->bindEvent('model.beforeSave', function () use ($model) {
			if ($model->locale === 'any') {
				$model->locale = null;
			}
		});

$model->addDynamicMethod('getLocaleOptions', function () {
			$activeLocales = \Winter\Translate\Models\Locale::listEnabled();
			return array_merge(['any' => 'Any'], $activeLocales);
		});

$locale = \App::getLocale();
		if (!\App::runningInBackend()) {
			$model::addGlobalScope('localized', function ($builder) use ($locale) {
				$builder->whereNull('locale')->orWhere('locale', $locale);
			});
		}
	}); 
}
```

A global scope is also added to the FileModel in order to only fetch the records with no locale (locale == null) or the currently active locale.

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Backend Plugin Development CMS Twig Themes Deployment