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I'm creating a image upload input field in blockForm which will output to Twig later. But got stuck due to some stuff.

public function blockForm($form, FormStateInterface $form_state){
        $form['image_file'] = [
            '#type' => 'managed_file',
            '#title' => $this->t('Upload Your Image'),
            '#default_value' => (isset($this->configuration['image_file']) ? $this->configuration['image_file'] : ""),
            '#weight' => '1',
            '#upload_location' => 'public://',
            '#upload_validators' => [
                'file_validate_extensions' => ['gif png jpg jpeg'],
            ],
        ];

       return $form;
    }

First thing is the '#upload_location', there are a lot of different answer online and the only difference is the path after public://, so I want to know what should I actually deal with it.

Second is the use, is there something missing or it is enough for achieve my goal.

The code I have now:

use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Block\BlockBase;
use Drupal\Core\Form\FormBuilder;
use Drupal\Core\Link;
use Drupal\image\Entity\ImageStyle;
use Drupal\paragraphs\Entity\Paragraph;

Hope someone can answer and help. Many Thanks.

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As i understand you could use something like this '#type' => 'file'

  $form['image_file']=array(  
    '#type' => 'file',
   '#title' => t('Upload YourImage'),
    '#upload_validators' => array(
    'file_validate_extensions' => array('gif'),),

        );
return $form;

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