Go to the Design Studio.
Select Images and Files in the left menu, then click next to the name of the file you want to delete.
Click the File Actions drop-down and select Delete.
Verify you’ve selected the correct file and click Delete.
Deleted images and files are completely removed from Marketo and cannot be recovered. They will no longer be displayed on any landing pages or emails where they were in use.
You’ll be returned to the Images and Files page, where you’ll see that your file has been deleted.