Modifying for own use, Do not use this in your project. I can make a change according to my needs. ¶yii2-redactor ¶

1. Modifying for own use, Do not use this in your project. I can make a change according to my needs.
2. Installation
3. Configure

This is a clone and modified version of Yii2-Redactor
Extension redactor for Yii2 Framework.
Installation ¶The preferred way to install this extension is through composer.
Either run
composer require --prefer-dist sahilr2050/yii2-redactor-s3 "*"

or
"sahilr2050/yii2-redactor-s3": "*"
to the require section of your composer.json.
Configure ¶Add to config file (config/web.php or common\config\main.php)
'modules' => [
'redactor' => 'Sahilr2050\redactor\RedactorModule',
],

or if you want to change the upload directory.
to path/to/uploadfolder
default value @webroot/uploads
'modules' => [
'redactor' => [
'class' => 'Sahilr2050\redactor\RedactorModule',
'uploadDir' => '@webroot/path/to/uploadfolder',
'uploadUrl' => '@web/path/to/uploadfolder',
'imageAllowExtensions'=>['jpg','png','gif']
],
],

note: You need to create uploads folder and chmod and set security for folder upload
reference: Protect Your Uploads Folder with .htaccess,
How to Setup Secure Media Uploads
Config view/form
<?= $form->field($model, 'body')->widget(\Sahilr2050\redactor\widgets\Redactor::className()) ?>

or not use ActiveField
<?= \Sahilr2050\redactor\widgets\Redactor::widget([
'model' => $model,
'attribute' => 'body'
]) ?>

or config advanced redactor reference Docs
<?= $form->field($model, 'body')->widget(\Sahilr2050\redactor\widgets\Redactor::className(), [
'clientOptions' => [
'imageManagerJson' => ['/redactor/upload/image-json'],
'imageUpload' => ['/redactor/upload/image'],
'fileUpload' => ['/redactor/upload/file'],
'lang' => 'zh_cn',
'plugins' => ['clips', 'fontcolor','imagemanager']
]
])?>

Bummer! i was tested on my project but not have many time to write document on file and usage.
If you have problem please create a issue
Thanks!