Can't remove files in hasMany relation (not set null from database table)

[santksharma]

   $form->hasMany('translations', function (Form\NestedForm $form) {
            $languages = Language::where('status', 1)->pluck('name', 'id');
            $form->select('language_id', __('Language'))->options($languages)->default('1')->creationRules('required');
            $form->text('title', __('Title'))->Rules(['required'])->placeholder('Section Title');
             $form->file('audio_male', __('Male Audio'))->Rules(['nullable'])->placeholder('Male Audio')->removable();
             $form->file('audio_female', __('Female Audio'))->Rules(['nullable'])->placeholder('Female Audio')->removable();
            $form->summernote('verse', __('Verse'))->Rules(['nullable'])->placeholder('Verse');
            $form->summernote('verse_translation', __('Verse Translation'))->Rules(['nullable'])->placeholder('Verse Translation');
            $form->summernote('word_defination', __('Word Definition'))->Rules(['nullable'])->placeholder('Word Definition');
            $form->summernote('summary', __('Summary'))->creationRules('nullable')->placeholder('Summary');
            $form->summernote('description', __('Description'))->creationRules('nullable')->placeholder('Description');
        });

it can not set null audio_male or audio_female from database table on remavable
Help me ? please