BookStack\Services\AttachmentService::saveUpdatedUpload PHP Method

    public function saveUpdatedUpload(UploadedFile $uploadedFile, Attachment $attachment)
    {
        if (!$attachment->external) {
            $this->deleteFileInStorage($attachment);
        }
        $attachmentName = $uploadedFile->getClientOriginalName();
        $attachmentPath = $this->putFileInStorage($attachmentName, $uploadedFile);
        $attachment->name = $attachmentName;
        $attachment->path = $attachmentPath;
        $attachment->external = false;
        $attachment->extension = $uploadedFile->getClientOriginalExtension();
        $attachment->save();
        return $attachment;
    }