file upload yii2 rest api
$uploads = UploadedFile::getInstancesByName("upfile");
if (empty($uploads)){
return "Must upload at least 1 file in upfile form-data POST";
}
// $uploads now contains 1 or more UploadedFile instances
$savedfiles = [];
foreach ($uploads as $file){
$path = //Generate your save file path here;
$file->saveAs($path); //Your uploaded file is saved, you can process it further from here
}