first upload all files

Modules/Slider/Entities/SliderSlideTranslation.php

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+<?php
+
+namespace Modules\Slider\Entities;
+
+use Modules\Support\Eloquent\TranslationModel;
+
+class SliderSlideTranslation extends TranslationModel
+{
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array
+     */
+    protected $fillable = [
+        'file_id',
+        'caption_1',
+        'caption_2',
+        'direction',
+        'call_to_action_text',
+    ];
+}