Verifique se $ _files está vazio PHP
if($_FILES['cover_image']['size'] == 0) {
// No file was selected for upload, your (re)action goes here
}
Delightful Dove
if($_FILES['cover_image']['size'] == 0) {
// No file was selected for upload, your (re)action goes here
}if ($_FILES['cover_image']['size'] == 0 && $_FILES['cover_image']['error'] == 0)
{
// cover_image is empty (and not an error)
}## CHECKS IF FILE IS EMPTY
if ($_FILES['file']['size'] == 0 && $_FILES['file']['error'] == 0)
{
// file is empty (and not an error)
}