dropzone js bootstrap 4 drag and drop asp core' code example
Example: dropzone accepted files
<script type="text/javascript">
Dropzone.options.dropzone = {
accept: function(file, done) {
console.log(file);
if (file.type != "image/jpeg") {
done("Error! Files of this type are not accepted");
}
else { done(); }
}
}
</script>