authoring: how do I delete custom thumbnails once I upload one?

[jayv25585659]

i cannot see an option to delete it. (The delete feature has to be available via touch/classic UI as our authors don't have access to CRX/DE)

I tried generate preview and the generated image is a preview of the page itself and not the original image that was there.

[Kamal_Kishor · Accepted solution]

@jayv25585659 : There is no option to delete it once you have provided a thumbnail. However, you can update it to restore to previously used thumbnail by below options I assume:-
Select Image - You can select the original thumbnail by choosing this option and select the original thumbnail image from DAM.

Upload Image - You could upload the original thumbnail by choosing "Upload Image".
If you were in middle of making changes and not happy with what you have selected, you see a 'Revert' option to un-do the changes, but that is until you have not saved your changes.
Please refer this to see the options to configure page thumbnail:-

https://experienceleague.adobe.com/docs/experience-manager-cloud-service/content/sites/authoring/fun...

[pulkitvashisth]

Unfortunately, the AEM does not provide a direct option to delete a custom thumbnail from the UI, you can remove the thumbnail from the system through the CRX/DE. This is because when a thumbnail is uploaded and used in the UI, AEM automatically generates different sized thumbnails, stored in thumbnail.png/jcr:content/dam:thumbnails. Even though the parent thumbnail.png is updated, these generated thumbnails remain the same.

The only way to clear them out is to go into CRX/DE and delete the dam:thumbnails folder. Then the next time the thumbnail is used in the UI, it will be recreated with new images in it.
https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager/how-do-you-to-change-clear...

[Harwinder-singh]

@jayv25585659 You can extend the OOTB DAM asset update workflow and add a custom process step to clean up any specific thumbnails. as soon as the asset processing is done, your custom process step should take care of that.

[kautuk_sahni]

@jayv25585659 Did you find the suggestions from users helpful? Please let us know if more information is required. Otherwise, please mark the answer as correct for posterity. If you have found out solution yourself, please share it with the community.