Can not upload with some different files on codeigniter - php

Question

I try to upload data with different type of extension with codeigniter but I have constraints file it does not go into the folder that I go. i try to make some config according to what i need, please help ..
function add_module_external(){
$id_module = '9090909';
$file_data = array();
$file_data2 = array();
$image_data = array();
$config_video = array();
$config_image["file_name"] = $id_module;
$config_image["upload_path"] = "./assets/file/image-module/";
$config_image["overwrite"] = TRUE;
$config_image["allowed_types"] = "gif|jpg|png|";
$this->load->library('upload', $config_image);
$this->upload->initialize($config_image);
$upload_background = $this->upload->do_upload('other_image');
if($upload_background){
$image_data = $this->upload->data();
$image = $image_data['file_name'];
}else{
$image = $this->input->post('background');
}
// pdf and ppt upload
$config_file['file_name'] = $id_module;
$config_file['upload_path'] = '/assets/file/materi-module/';
$config_file['overwrite'] = TRUE;
$config_file['allowed_types'] = 'pdf';
$this->load->library('upload', $config_file);
$this->upload->initialize($config_file);
$upload_pdf = $this->upload->do_upload('pdf_data');
if($upload_pdf){
$file_data = $this->upload->data();
$content = $file_data["file_name"];
}else if($upload_ppt){
$file_data2 = $this->upload->data();
$content = $file_data2["file_name"];
}else if($upload_video){
$config_video = $this->upload->data();
$content = $config_video["file_name"];
}else{
$content = $this->input->post("text_data");
}
$query = $this->my_module->new_module($image, $id_module, $content);
redirect($this->agent->referrer());
}