The additional format sales are shown in your Earnings section, just like the other regular sales.
If a buyer asks for an additional format, it's not a guarantee that he would actually buy it. Usually, it happens. But if the buyer needs the additional format fast, and you upload it too late, he may buy the .jpg, or choose another file which has an additional format already available.
You can upload the additional format for all your .jpg files, in order to avoid this delay.
There normally is addional text while it is pending review. You should get a confirmation screen that the upload was successful. If it is not accepted, an email is sent to you and the additional file uploaded field changes back to no.