pickFiles method
Implementation
Future<List<dynamic>> pickFiles(bool multiple, List<String> mime) {
final completer = Completer<List<dynamic>>();
final picker = FileUploadInputElement();
final isSafari =
window.navigator.userAgent.toLowerCase().contains('safari');
if (isSafari) document.body!.append(picker);
picker.multiple = multiple;
if (mime.isNotEmpty) picker.accept = mime.join(',');
picker.onChange.listen((_) {
completer.complete(picker.files);
if (isSafari) picker.remove();
});
picker.click();
return completer.future;
}