Image were not loading in column View/list view in Dam asset folder.

[maturubhanu]

Hi,

I uploaded a png and svg images into DAM folder. Few svg & png images were able to see in grid/column view or any other view also but not other images. When i select and open the image then i am able to see. Is there any failure or rendition restriction i checked all but i didn't get cluse. Can anyone help on this please. I am attaching the screenshot below. First image is not visible but second and third images were able to see. BUt when i select and open the first image able to see the image but not in grid/column view. 

Can you please help me on this.

Thanks,

Bhanu M.

[SantoshSai · Accepted solution]

Hi @maturubhanu,

Most likely, because of:

1. Thumbnail Renditions Not Generated

   • AEM uses a workflow (DAM Update Asset) to generate renditions (thumbnails, etc.) on asset upload. If it failed or skipped the image, you won’t see a preview in list/grid view.

   • SVGs especially can fail silently if malformed or contain unsupported scripts/styles.

2. File Format Issues

   • Certain PNGs or SVGs might be encoded in ways that are incompatible with AEM’s thumbnail service (e.g., indexed color PNGs, or overly complex SVGs).

3. Workflow Failure or Bypass

   • If the DAM Update Asset workflow didn’t trigger properly (e.g., due to configuration, timing, or bulk upload tools), renditions may not be present.

4. Preview Disabled for SVGs (Security)

   • Some AEM setups disable SVG previews in the UI for security reasons (as SVGs can contain JavaScript). That could explain why only some show thumbnails.

Here is how you can investigate

1. Check Renditions

   • Go to /assets.html > Navigate to the image > Select it > Click "View Renditions".

   • See if the thumbnail (cq5dam.thumbnail.*.png) exists for the problematic image.

   • If missing, the asset has no preview to display in list/grid view.

2. Manually Trigger DAM Update Asset Workflow

   • Select the image(s)

   • Click Timeline > Start Workflow

   • Choose DAM Update Asset

   • Let it finish and refresh the folder.

3. Check Workflow Logs

   • View error.log or workflow.log in /system/console/slinglog after triggering the workflow.

   • Look for errors like "Unable to process rendition" or "Unsupported MIME type."