It's a simple and effective file uploading plugin for CakePHP 3.x

Download the zip file,extract it and put the package in plugins directory.

Import the SQL file into MySQL available in this plugin

In config/bootstrap.php
Loads a single plugin
Plugin::load('Fyluploader');

you may need to modify your application’s composer.json file to contain the following information:
"autoload": {
"psr-4": {
(...)
"Fyluploader\": "./plugins/Fyluploader/src",
}
}
"autoload-dev": {
"psr-4": {
(...)
"Fyluploader\Test\": "./plugins/Fyluploader/tests"
}
}

In plugins\Fyluploader\config\rotes.php :