My most usual workflow is that I list a new item by starting to create the listing, uploading pictures for it, etc etc.
When I do this I then have to check the checkboxes for those recently uploaded pics and click Select. It would be convenient if those checkboxes were already populated with ticks.
Admittedly it's a small matter, but anything that makes the process smoother helps users feel positive. Or is it likely that some would not want those checkboxes ticked? Perhaps there are scenarios I've not considered?