Board Thread:Support Requests - Getting Technical/@comment-31402001-20140725135947/@comment-4018164-20140725143226

It seems like you can (using a collapse button, not a label): 

 You have to know the dimensions of both the image and the button for positioning it correctly, though it's not very efficient (on mobile preview, for example, you don't have the collapse option, and you have that extra image on the page).

A better way that still has a very good support in all modern browsers should be using  attributes for specifying an image URL, and then using some JavaScript to use that image as a button background. This is also possible using CSS, but the support isn't as good.

Or, if you only want to apply a certain image on a specific collapsible table, you can directly use CSS.