To answer your last question, you have to edit the submission you want to delete, then you empty the different blocs that you may have filled previously, then you save it. Your submission should be empty at this stage and then it should be possible to delete it.
To answer your last question, you have to edit the submission you want to delete, then you empty the different blocs that you may have filled previously, then you save it. Your submission should be empty at this stage and then it should be possible to delete it.