SilverStripe 4 - Upload file from uploaded file from frontend form

example.php

        if (isset($data['FileID']) && $data['FileID'] && $data['FileID']['error'] == 0) {
            $attachment = $data['FileID'];
            try {
                $upload = Upload::create();
                $file = File::create();
                $file->Title = $attachment['name'];
                $folder = Folder::find_or_make('Uploads/FolderName/' . Security::getCurrentUser()->ID);
                $upload->loadIntoFile($attachment, $file, $folder->getFilename());
                $fileID = $file->write();
                $app->AttachmentID = $fileID;
                $app->FileUploadDate = DBDatetime::now()->Format('y-MM-dd');
            } catch (ValidationException $e) {
                $form->sessionMessage('There was an issue with uploading the file. Please try again.', 'bad');
                return;
            } catch (\Exception $e) {
                $form->sessionMessage('There was an issue with uploading the file. Please try again.', 'bad');
                return;
            }
        }