---
title: "Preview not Showing in Browser - Lasernet FO Connector"
slug: "preview-not-showing-in-browser"
description: "This page describes a solution/workaround for when the Preview of a report from Lasernet FO Connector is not shown in a new browser tab."
tags: ["Lasernet FO Connector", "Finance and Operations", "Parameters"]
updated: 2026-02-10T13:58:51Z
published: 2026-02-10T13:58:51Z
canonical: "kb.lasernetgroup.com/preview-not-showing-in-browser"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://kb.lasernetgroup.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Preview not Showing in Browser

To access the **Lasernet parameters** area, navigate to **Lasernet** > **Setup** > **Performance**. Here, you will find the **Preview in new browser tab** button. To create documents successfully, toggle it to **Yes**.

![](https://cdn.document360.io/c831ef63-c6b3-48ee-b443-3e33644e4e2e/Images/Documentation/image-TWQYY04B.png)

When you toggle this button to **No**, Dynamics will not show the document, throwing instead an error message or, in some cases, no display at all.

![](https://cdn.document360.io/c831ef63-c6b3-48ee-b443-3e33644e4e2e/Images/Documentation/1623228811627.png)

> [!CAUTION]
> Error
> 
> Value cannot be null. Parameter name: externalId

## Solution

As a workaround, follow these steps:

1. Navigate to **Organization administration** > **Document management** > **Document types** and add a new entry. Ensure that a location is selected in the **Location** drop-down menu.

![](https://cdn.document360.io/c831ef63-c6b3-48ee-b443-3e33644e4e2e/Images/Documentation/image-KDUD9Q5S.png)

1. Ensure the entry is first on the list (alphabetically - must start with an “A”).

This problem is also caused by a user selecting the first entry in the list when preparing the preview in the browser, which requires **DocuValue**.

### Lasernet FO Connector 6.1.0.3

To avoid this issue, an extra option has been introduced in Lasernet FO Connector 6.1.0.3. This option has been added through the field **Document type for preview** and is located in **Lasernet** > **Setup** > **Parameters** > **Performance**.

The option ensures the correct document type is used if there is a modification to the destination (Azure Storage, SharePoint, etc.).

The option is required only if multiple destination types are or have been used. It is only available when the **Preview in new browser tab** button is toggled to **No**.

![](https://cdn.document360.io/c831ef63-c6b3-48ee-b443-3e33644e4e2e/Images/Documentation/image-FJ72JIUU.png)