Here is a step by step To-Do list for Yii beginners. The list is an advice of what tutorials and documentation you can walk through to get a full understanding of the Yii Framework. These can be a help to learn Yii.
Uploading files in a webapp can be extremely tricky and sometimes the quickest way to do it is to store the file directly in the webserver or into a DNS (like Amazon S3) and then to save the link and the metadata inside a table in the DB. The thing is that you'll have to deal with file permissions, server storage, file management and so on (which is perfectly fine, by the way).
I have an API. It's built with a RESTful extension over Active Record, and some endpoints provide PUT methods to upload files. By a REST design we create an entity with
POST /video first, and then upload a video file with
The Problem: Yii2 utilizes by default UserIdentity configured in config/web.php for connection, this object apply one table to authentication ('identityClass' => 'app\panel\models\User'). How to authentication from diferent tables? Solution: Create instances in web.php to uses UserIdentify. eg: