Uploading files in yii2 debug?

Question

Yii

Hello!
Faced such a problem, I upload a picture using UploadForm (the standard algorithm for uploading files in yii2). Everything would be fine, but one picture stubbornly refuses to load, moreover, if you remove the line from the rules :'extensions' => 'jpg, png'

public function rules()
    {
        return [
            [['imageFile'], 'file', 'skipOnEmpty' => false, 'extensions' => 'jpg, png'],
        ];
    }

the picture is loading. It turns out that the validator considers that the uploaded file is not jpg, although it is very jpg for my modest taste. Tell me how to track this error, what exactly does the validator not like?

Answer 1

Maybe it's not jpg, but jp e g?)

Answer 2

And so?
'extensions' => ['jpg', 'png']

Answer 3

You can debug in the class yii\validators\FileValidator