@laura-aome, do you use Lightroom to edit your photos? If so, you can export them as DNG. If not, look around in the photo editing program that you use to see if you are able to “export” or “save as” a file that is “original+edits” or something like that. Those would be the ones to submit via the Dropbox.
If you can not find anything like that, then yes, do go ahead and re-upload the newly-edited JPGs!