IN list view of asset browser, I want to add a new toolbar action which on clicking would update properties of the selected assets and display a dialog to user. Is there a sample on how to exactly add this action only in the assets view and not on all toolbars?
See this article - which includes a Ask the Community Experts session on how to modify the AEM UI:
There is a note at the start of the article that includes the webinar.
There is also a GITHub sample site: https://github.com/Adobe-Marketing-Cloud/aem-admin-extension-customize-sites
You can also look at the documentation:
Which references the github sample:
Wishing you a very happy new year.
Adding some reference article for extending list view columns:
// For adding a column to AEM 61 List View check this post
// Adding custom columns to Sites' list view
I hope this would help you.