Keeping track of what content items have assets can be a daunting task. That's were our attachment(s) column comes in handy.
Within our Content Interface is the option to select the Attachments column from the Edit Columns dropdown.
Content Interface Attachment(s) Column
Once you've selected the Attachments column and apply it, you will have an additional column for each content item in your Content Interface view. This column will contain a paperclip icon with a number next to it if the content item has an attachment(s) associated with it, and will have 0 if there are no attachments included with it.
Note: You must scroll all the way to the bottom of your filters and choose "Apply" in order to see your new columns.