exchange/app/Models/News.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Backpack\CRUD\app\Models\Traits\SpatieTranslatable\HasTranslations;
use Illuminate\Support\Str;
use Intervention\Image\ImageManagerStatic as Image;

class News extends Model
{
    use \Backpack\CRUD\app\Models\Traits\CrudTrait;
    use HasFactory;
    use HasTranslations;

    protected $guarded = [''];
    public $translatable = ['title', 'short_description', 'description'];

    public static function boot()
    {
        parent::boot();
        static::deleted(function($obj) {
            \Storage::disk('uploads')->delete($obj->image);
        });
    }

    public function setImageAttribute($value)
    {
        $attribute_name = "image";
        // or use your own disk, defined in config/filesystems.php
        $disk = config('backpack.base.root_disk_name');
        // destination path relative to the disk above
        $destination_path = "public/uploads/news";

        // if the image was erased
        if (empty($value)) {
            // delete the image from disk
            if (isset($this->{$attribute_name}) && !empty($this->{$attribute_name})) {
                \Storage::disk($disk)->delete($this->{$attribute_name});  
            }
            // set null on database column
            $this->attributes[$attribute_name] = null;
        }

        // if a base64 was sent, store it in the db
        if (Str::startsWith($value, 'data:image'))
        {
            // 0. Make the image
            $image = \Image::make($value)->encode('jpg', 90);

            // 1. Generate a filename.
            $filename = md5($value.time()).'.jpg';

            // 2. Store the image on disk.
            \Storage::disk($disk)->put($destination_path.'/'.$filename, $image->stream());

            // 3. Delete the previous image, if there was one.
            if (isset($this->{$attribute_name}) && !empty($this->{$attribute_name})) {
                \Storage::disk($disk)->delete($this->{$attribute_name});
            }

            // 4. Save the public path to the database
            // but first, remove "public/" from the path, since we're pointing to it
            // from the root folder; that way, what gets saved in the db
            // is the public URL (everything that comes after the domain name)
            $public_destination_path = Str::replaceFirst('public/', '', $destination_path);
            $this->attributes[$attribute_name] = $public_destination_path.'/'.$filename;

            // TODO 
            // crop image to 300x300    
        } elseif (!empty($value)) {
            // if value isn't empty, but it's not an image, assume it's the model value for that attribute.
            $this->attributes[$attribute_name] = $this->{$attribute_name};
        }
    }
}