portal-api/app/Models/ServiceAttachment.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\Storage;

class ServiceAttachment extends Model
{
    public const UPLOAD_RULE = 'required|file|mimes:jpg,jpeg,png,gif,webp,pdf,doc,docx,xls,xlsx,zip|max:51200';

    public const AUDIENCE_ADMIN = 'admin';
    public const AUDIENCE_CUSTOMER = 'customer';

    protected $guarded = [];

    protected $appends = ['url'];

    public function scopeForCustomer($query)
    {
        return $query->where('audience', self::AUDIENCE_CUSTOMER);
    }

    public function service()
    {
        return $this->belongsTo(Service::class);
    }

    public function getUrlAttribute(): string
    {
        return Storage::disk($this->disk)->url($this->path);
    }
}