How do I delete attachments from my account?
To view and edit attachments for your entire account, across all projects, go to your-account.lighthouseapp.com/attachments (the your-account bit would be the name of your own account). From there you'll see the option to delete multiple attachments.
You can search by Project, Date, Filename and Size by clicking on each header to sort. You may delete individual files or entire pages by checking the top box.