How to fix the problem with uploaded images not showing in PrestaShop?

The most common reason for this problem is that the pictures are being uploaded with incorrect permissions. As a result of this, the Apache service cannot access them correctly and returns a 403 error.

To resolve the issue, access your account via FTP or using File Manager in your Site Tools and find the images.inc.php file. Open the file and find the lines below:

imagedestroy($ressource);
return $flag;

On a new line just above them you should add:

chmod($filename, 0755);

After the change, the lines will look as follows:

chmod($filename, 0755);
imagedestroy($ressource);
return $flag;

This rule will change the permissions for the uploaded pictures to 755 and they will be properly displayed.