Download assets from Adobe Experience Manager

You can download assets including static and dynamic renditions. Alternatively, you can send emails with links to assets directly from Adobe Experience Manager Assets. Downloaded assets are bundled in a ZIP file.

NOTE

Recipients of emails must be members of the dam-users group to access the ZIP download link in the email message. To be able to download the assets, the members must have permissions to launch workflows that trigger downloading of assets.

The asset types Image Sets, Spin Sets, Mixed Media Sets, and Carousel Sets cannot be downloaded.

You can download Experience Manager assets using the following methods:

Download assets using Experience Manager interface

Asynchronous download service provides a framework for seamless download of large-sized assets. Smaller files are downloaded from the user interface in real time. Experience Manager does not archive single asset downloads where the original file is downloaded. This functionality allows for faster downloads.

By default, Experience Manager triggers a notification upon completion of the download workflow. The download notification appears in the Experience Manager Inbox.

Inbox notification

Enable email notifications for large downloads

Asynchronous downloads are triggered in any of the following cases:

  • If there are more than ten assets
  • If the download size is more than 100 MB
  • If the download takes more than 30 seconds to prepare

While the asynchronous download runs at the backend, the user can continue to explore and work further in Experience Manager. An out-of-the-box mechanism is required to notify the user upon completion of the download process. To achieve this objective, the administrators can configure email service by setting up an SMTP server. See configure Mail Service.

Once the email service is configured, the administrators and users can enable email notifications from the Experience Manager interface.

To enable email notifications:

  1. Log in to Experience Manager Assets.

  2. Click the user icon from the upper-right corner and then click My Preferences. The User Preferences window opens.

  3. Select the Asset Download email notifications check box and click Accept.

    enable-email-notifications-for-large-downloads

To download assets, follow these steps:

  1. In Experience Manager user interface, click Assets > Files.

  2. Navigate to the assets you want to download. Select the folder or select one or more assets within the folder. On the toolbar, click Download.

    Available options when downloading assets from Experience Manager Assets

  3. In the download dialog box, select the download options that you want.

    Download option Description
    Create separate folder for each asset Select this option to include each asset you download–including assets in child folders nested under the parent folder of the asset–into one folder on your local computer. When this option is not select, by default, the folder hierarchy is ignored and all assets are downloaded into one folder in your local computer.
    Email Select this option to have an email notification sent to the recipient. Standard emails templates are available at the following locations:
    • /libs/settings/dam/workflow/notification/email/downloadasset.
    • /libs/settings/dam/workflow/notification/email/transientworkflowcompleted.
    Templates that you customize during deployment are available at the following locations:
    • /apps/settings/dam/workflow/notification/email/downloadasset.
    • /apps/settings/dam/workflow/notification/email/transientworkflowcompleted.
    You can store tenant-specific custom templates at the following locations:
    • /conf/<tenant_specific_config_root>/settings/dam/workflow/notification/email/downloadasset.
    • /conf/<tenant_specific_config_root>/settings/dam/workflow/notification/email/transientworkflowcompleted.
    Asset(s) Select this option to download the asset in its original form without any renditions.
    The subassets option is available if the original asset has subassets.
    Rendition(s) A rendition is the binary representation of an asset. Assets have a primary representation - that of the uploaded file. They can have any number of representations.
    With this option, you can select the renditions you want downloaded. The renditions that are available depend on the asset you selected.
    Smart Crops Select this option to download all the smart crop renditions of the selected asset from within Experience Manager. A zip file with the Smart Crop renditions is created and downloaded to your local computer.
    Dynamic Rendition(s) Select this option to generate a series of alternate renditions in real time. When you select this option, you also select the renditions that you want to create dynamically by selecting from the Image Preset list.
    In addition, you can select the size and unit of measurement, format, color space, resolution, and any optional image modifiers such as inverting the image. The option is only available if you have Dynamic Media enabled.
  4. In the dialog box, click Download.

    If email notification is enabled for large downloads, an email containing a download URL of the archived zip folder appears in your inbox. Click on the download link from the email to download the zip folder.

    email-notifications-for-large-downloads

    You can also view the notification in your Experience Manager Inbox.

    inbox-notifications-for-large-downloads

Sharing assets using a link is a convenient way to make it available to interested people without them having to first log in to Assets. See Link Share functionality.

When users download assets from shared links, Assets uses an asynchronous service that offers faster and and uninterrupted downloads. The assets to be downloaded are queued in the background in an inbox into ZIP archives of manageable file size. For very large downloads, the download is chunked into files of 100 GB in size.

The inbox displays the processing status of each archive. Once the processing is complete, you can download the archives from the inbox.

Download inbox

Enable asset download servlet

The default servlet in Experience Manager allows authenticated users to issue arbitrarily-large, concurrent download requests to create ZIP files of assets. The download preparation can have performance implications or can even overload the server and the network. To mitigate such potential DoS-like risks caused by this feature, AssetDownloadServlet OSGi component is disabled for publish instances. If you do not need the download feature on author instances, disable the servlet on author.

To allow downloading assets from your DAM, say when using something like Asset Share Commons or other portal-like implementation, manually enable the servlet via an OSGi configuration. Adobe recommends setting the permissible download size as low as possible without affecting the day-to-day download requirements. A high value may impact performance.

  1. Create a folder with a naming convention that targets the publish runmode, that is, config.publish:

    /apps/<your-app-name>/config.publish

  2. In the config folder, create a new file of type nt:file named com.day.cq.dam.core.impl.servlet.AssetDownloadServlet.config.

  3. Populate com.day.cq.dam.core.impl.servlet.AssetDownloadServlet.config with the following. Sets a maximum size (in bytes) for the download as value of asset.download.prezip.maxcontentsize. The below sample configures the maximum size of the ZIP download to not exceed 100 kB.

    enabled=B"true"
    asset.download.prezip.maxcontentsize=I"102400"
    

Disable asset download servlet

If you do not need the download functionality, then disable the servlet to prevent any DoS-like risks. The Asset Download Servlet can be disabled on an Experience Manager author and publish instances by updating the dispatcher configuration to block any asset download requests. The servlet can also be manually disabled via the OSGi console directly.

  1. To block asset download requests via a dispatcher configuration edit the dispatcher.any configuration and add a new rule to the filter section.

    /0100 { /type "deny" /url "*.assetdownload.zip/assets.zip*" }

Tips and limitations

  • If you download an empty folder, Experience Manager conveys a success message about creating a ZIP archive, but the archive is not created.

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