File Upload with TYPO3 8.7.13

Controller.php

<?php
  namespace Vendor\MyExt\Controller;

  class MyController extends ActionController
  {

    /**
     * action create
     *
     * @param \Vendor\MyExt\Domain\Model\MyModel $myModel
     *
     * @return void
     */
    public function createAction(MyModel $myModel)
    {
      $this->myModelRepository->add($myModel);
      $this->persistenceManager->persistAll();

      $this->redirect('list');
    }

    public function initializeCreateAction()
    {
      if ($this->request->hasArgument('myModel')) {
        $data                         = $this->request->getArgument('myModel');
        $propertyMappingConfiguration = $this->arguments->getArgument('myModel')->getPropertyMappingConfiguration();

        # Prevent from errors without uploads
        foreach (['logo', 'pdf', 'images'] as $uploadField) {
          if (array_key_exists($uploadField, $data) && is_array($data[$uploadField])) {
            foreach ($data[$uploadField] as $key => $value) {
              if ($value['error'] == UPLOAD_ERR_NO_FILE) {
                unset($data[$uploadField][$key]);
              } else {
                # if not empty allow property with sub properties
                $propertyMappingConfiguration->forProperty($uploadField)->allowProperties($key)->allowAllProperties();
              }
            }
            # if no uploaded file remove field completly
            if (empty($data[$uploadField])) {
              unset($data[$uploadField]);
            }
          }
        }

        $this->request->setArgument('myModel', $data);
      }
    } 
  }

MyModel.php

<?php
  namespace Vendor\MyExt\Domain\Model;

  class MyModel extends AbstractEntity
  {

    /**
     * __construct
     */
    public function __construct()
    {
      //Do not remove the next line: It would break the functionality
      $this->initStorageObjects();
    }

    /**
     * Initializes all ObjectStorage properties
     *
     * @return void
     */
    protected function initStorageObjects()
    {
      $this->logo       = new ObjectStorage();
      $this->images     = new ObjectStorage();
      $this->pdf        = new ObjectStorage();
    }

    /**
     * @var \TYPO3\CMS\Extbase\Persistence\ObjectStorage<\TYPO3\CMS\Extbase\Domain\Model\FileReference>
     * @cascade remove
     */
    protected $images = null;

    /**
     * @var \TYPO3\CMS\Extbase\Persistence\ObjectStorage<\TYPO3\CMS\Extbase\Domain\Model\FileReference>
     * @cascade remove
     * @validate NotEmpty
     */
    protected $logo = null;

    /**
     * @var \TYPO3\CMS\Extbase\Persistence\ObjectStorage<\TYPO3\CMS\Extbase\Domain\Model\FileReference>
     * @cascade remove
     */
    protected $pdf = null;

    /**
     * Returns the images
     *
     * @return \TYPO3\CMS\Extbase\Persistence\ObjectStorage<\TYPO3\CMS\Extbase\Domain\Model\FileReference> $images
     */
    public function getImages()
    {
      return $this->images;
    }

    /**
     * Sets the images
     *
     * @param \TYPO3\CMS\Extbase\Persistence\ObjectStorage<\TYPO3\CMS\Extbase\Domain\Model\FileReference> $images
     *
     * @return void
     */
    public function setImages(ObjectStorage $images)
    {
      $this->images = $images;
    }

    /**
     * Returns the logo
     *
     * @return \TYPO3\CMS\Extbase\Persistence\ObjectStorage<\TYPO3\CMS\Extbase\Domain\Model\FileReference> $logo
     */
    public function getLogo()
    {
      return $this->logo;
    }

    /**
     * Sets the logo
     *
     * @param \TYPO3\CMS\Extbase\Persistence\ObjectStorage<\TYPO3\CMS\Extbase\Domain\Model\FileReference> $logo
     *
     * @return void
     */
    public function setLogo(ObjectStorage $logo)
    {
      $this->logo = $logo;
    }

    /**
     * Returns the pdf
     *
     * @return \TYPO3\CMS\Extbase\Persistence\ObjectStorage<\TYPO3\CMS\Extbase\Domain\Model\FileReference> $pdf
     */
    public function getPdf()
    {
      return $this->pdf;
    }

    /**
     * Sets the pdf
     *
     * @param \TYPO3\CMS\Extbase\Persistence\ObjectStorage<\TYPO3\CMS\Extbase\Domain\Model\FileReference> $pdf
     *
     * @return void
     */
    public function setPdf(ObjectStorage $pdf)
    {
      $this->pdf = $pdf;
    }
  }

TCA.php

<?php
  return [
    'ctrl' => [
      /**** strip ***/
    ],
    'interface' => '...',
    'types' => '...',
    'columns' => [
      /**** strip ***/ 
      'logo'               => [
        'exclude' => false,
        'label'   => 'LLL:EXT:myext/Resources/Private/Language/locallang_db.xlf:tx_myext_domain_model_mymodel.logo',
        'config'  => \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::getFileFieldTCAConfig('logo', [
          'appearance'    => [
            'createNewRelationLinkTitle' => 'LLL:EXT:frontend/Resources/Private/Language/locallang_ttc.xlf:images.addFileReference'
          ],
          'foreign_types' => [
            '0'                                                 => [
              'showitem' => '
                            --palette--;LLL:EXT:lang/locallang_tca.xlf:sys_file_reference.imageoverlayPalette;imageoverlayPalette,
                            --palette--;;filePalette'
            ],
            \TYPO3\CMS\Core\Resource\File::FILETYPE_TEXT        => [
              'showitem' => '
                            --palette--;LLL:EXT:lang/locallang_tca.xlf:sys_file_reference.imageoverlayPalette;imageoverlayPalette,
                            --palette--;;filePalette'
            ],
            \TYPO3\CMS\Core\Resource\File::FILETYPE_IMAGE       => [
              'showitem' => '
                            --palette--;LLL:EXT:lang/locallang_tca.xlf:sys_file_reference.imageoverlayPalette;imageoverlayPalette,
                            --palette--;;filePalette'
            ],
            \TYPO3\CMS\Core\Resource\File::FILETYPE_AUDIO       => [
              'showitem' => '
                            --palette--;LLL:EXT:lang/locallang_tca.xlf:sys_file_reference.imageoverlayPalette;imageoverlayPalette,
                            --palette--;;filePalette'
            ],
            \TYPO3\CMS\Core\Resource\File::FILETYPE_VIDEO       => [
              'showitem' => '
                            --palette--;LLL:EXT:lang/locallang_tca.xlf:sys_file_reference.imageoverlayPalette;imageoverlayPalette,
                            --palette--;;filePalette'
            ],
            \TYPO3\CMS\Core\Resource\File::FILETYPE_APPLICATION => [
              'showitem' => '
                            --palette--;LLL:EXT:lang/locallang_tca.xlf:sys_file_reference.imageoverlayPalette;imageoverlayPalette,
                            --palette--;;filePalette'
            ]
          ],
          'maxitems'      => 1
        ], $GLOBALS['TYPO3_CONF_VARS']['GFX']['imagefile_ext']),
      ],
      'pdf' => [] # same as logo
      'images' => [] # same as logo; without maxitems
      /**** strip ***/ 
    ],
  ];

Template.html

<f:form action="create" enctype="multipart/form-data" name="myModel" object="{myModel}" class="form-horizontal">
  <div class="form-group {s:form.ifHasError(property:'myModel.logo', then:'has-error')}">
    <label for="logo" class="col-sm-2 control-label"><f:translate key="tx_myext_domain_model_mymodel.logo" /> <span class="required">*</span></label>
    <div class="col-sm-10">
      <f:form.upload property="logo.0" id="logo" class="form-control"/>
    </div>
  </div>

  <div class="form-group {s:form.ifHasError(property:'myModel.images', then:'has-error')}">
    <label for="images" class="col-sm-2 control-label"><f:translate key="tx_myext_domain_model_mymodel.images" /></label>
    <div class="col-sm-10">
      <f:form.upload property="images" id="images" multiple="1" class="form-control"/>
    </div>
  </div>

  <div class="form-group {s:form.ifHasError(property:'myModel.pdf', then:'has-error')}">
    <label for="pdf" class="col-sm-2 control-label"><f:translate key="tx_myext_domain_model_mymodel.pdf" /></label>
    <div class="col-sm-10">
      <f:form.upload property="pdf.0" id="pdf" class="form-control"/>
    </div>
  </div>
</f:form>