Yii routing error, how to fix?

Question

Yii

The bottom line is, there is a silder module designed to add images for the slider, and here such a problem is the /slider/backend/main/create route in which the form for adding an image, and when submit is pressed, a post request is sent to this route , but the application throws 404, it turns out that the get request works fine, the post does not, yii does not seem to filter by type for normal requests, what is the error, how to make the post request work normally too?