cssd-back/app/Models/Uploadable.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class Uploadable extends Model
{
    use HasFactory;

    protected $fillable = [
        'uploadable_id', 'uploadable_type', 'gallery_id', 'image_role', 'batch_id'
    ];
    public $timestamps = false;

    public function gallery(): BelongsTo
    {
        return $this->belongsTo(Gallery::class);
    }

}