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

# Thumbnail Preview Images

> Set up thumbnail and preview images for content to enhance visual discovery and user engagement.

When viewing a list of dashboards, Curator has the ability to display a custom preview of the Tableau Server view as a
thumbnail image.

These thumbnails can either be set manually while creating or
[editing a Dashboard](https://docs.curator.interworks.com/site_content_design/pages/pages_overview.md) or the system will attempt to automatically grab the
thumbnail from the Tableau Server if the Dashboard is created without one.

Automatic thumbnail generation does not apply to Tableau Public dashboards. Tableau Public retired the `.png`
download endpoint that Curator relied on, so Tableau Public dashboards can no longer have their thumbnails generated
automatically and will always display a generic placeholder instead. To show a real image for a Tableau Public
Dashboard, upload a custom thumbnail manually using the steps below.

Views with very large fixed layouts (such as long scrolling dashboards) are automatically scaled down to thumbnail
size. In rare cases an extremely large view may still fall back to the generic placeholder — set an Alternate
Thumbnail URL pointing to a smaller view, or upload a custom thumbnail manually using the steps below.

Once the Dashboard is created you can manually refresh the thumbnail by pressing the Refresh Thumbnail button.

***To refresh the dashboards thumbnail:***

1. Login to the backend of your Curator instance (e.g. `http://curatorexample.com/backend`).
2. Navigate to the **Tableau** > **Dashboards** section from the left-hand menu.
3. Click on the "New Dashboard" button or select an existing Dashboard.
4. In the **Display** tab, click the "Refresh Thumbnail" button. If the Dashboard has an uploaded thumbnail, confirm
   that you want to replace it with an image from Tableau.

You can manually upload a thumbnail on the Dashboard edit page.

***To manually upload a thumbnail:***

1. Login to the backend of your Curator instance (e.g. `http://curatorexample.com/backend`).
2. Navigate to the **Tableau** > **Dashboards** section from the left-hand menu.
3. Click on the "New Dashboard" button or select an existing Dashboard.
4. In the **Display** tab, use the Thumbnail Image form to upload your custom image.
   *Note: You will need to click the "X" in the bottom-right corner to remove an existing image.*
5. Click the "Save" button.

An uploaded thumbnail stays in place: the nightly thumbnail refresh skips it, and the Refresh Thumbnail button asks
for confirmation before replacing it. Removing the uploaded image returns the Dashboard to automatic refreshes.

***To set a global default thumbnail:***

1. Login to the backend of your Curator instance (e.g. `http://curatorexample.com/backend`).
2. Navigate to the **Settings** > **Curator** > **Portal Settings** section from the left-hand menu.
3. Click on the **Home** tab and expand the Tile Type section.
4. Use the "Custom Default Thumbnail" form to upload your custom image.
   *Note: You will need to click the "X" in the bottom-right corner to remove an existing image.*
5. If you wish to use this image for *all* dashboards, disable *Refresh Dashboard Thumbnails* under **Settings** >
   **Curator** > **Portal Settings** > **Features** tab.

Curator also has a feature to enable nightly refreshes of the site's Dashboard thumbnails. This helps to keep the thumbnail
up to date with any changes while also saving time from manually updating every Dashboard thumbnail. Dashboards with
an uploaded thumbnail are skipped, so the nightly refresh never replaces an image you uploaded.

***Enabling or Disabling Refresh Dashboard Thumbnails:***

1. Login to the backend of your Curator instance (e.g. `http://curatorexample.com/backend`).
2. Navigate to the **Settings** > **Curator** > **Portal Settings** section from the left-hand menu.
3. Click on the **Features** tab at the top of the main page content.
4. Toggle the switch to enable/disable *Refresh Dashboard Thumbnails* setting under the Functionality section and click
   the "Save" button.


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