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diff --git a/web/core/modules/file/file.field.inc b/web/core/modules/file/file.field.inc
new file mode 100644
index 000000000..80ffbe997
--- /dev/null
+++ b/web/core/modules/file/file.field.inc
@@ -0,0 +1,209 @@
+<?php
+
+/**
+ * @file
+ * Field module functionality for the File module.
+ */
+
+use Drupal\Core\Field\FieldDefinitionInterface;
+use Drupal\Core\Field\FieldFilteredMarkup;
+use Drupal\Core\Render\Element;
+
+/**
+ * Prepares variables for multi file form widget templates.
+ *
+ * Default template: file-widget-multiple.html.twig.
+ *
+ * @param array $variables
+ *   An associative array containing:
+ *   - element: A render element representing the widgets.
+ */
+function template_preprocess_file_widget_multiple(&$variables) {
+  $element = $variables['element'];
+
+  // Special ID and classes for draggable tables.
+  $weight_class = $element['#id'] . '-weight';
+  $table_id = $element['#id'] . '-table';
+
+  // Build up a table of applicable fields.
+  $headers = [];
+  $headers[] = t('File information');
+  if ($element['#display_field']) {
+    $headers[] = [
+      'data' => t('Display'),
+      'class' => ['checkbox'],
+    ];
+  }
+  $headers[] = t('Weight');
+  $headers[] = t('Operations');
+
+  // Get our list of widgets in order (needed when the form comes back after
+  // preview or failed validation).
+  $widgets = [];
+  foreach (Element::children($element) as $key) {
+    $widgets[] = &$element[$key];
+  }
+  usort($widgets, '_field_multiple_value_form_sort_helper');
+
+  $rows = [];
+  foreach ($widgets as $key => &$widget) {
+    // Save the uploading row for last.
+    if (empty($widget['#files'])) {
+      $widget['#title'] = $element['#file_upload_title'];
+      $widget['#description'] = \Drupal::service('renderer')->renderPlain($element['#file_upload_description']);
+      continue;
+    }
+
+    // Delay rendering of the buttons, so that they can be rendered later in the
+    // "operations" column.
+    $operations_elements = [];
+    foreach (Element::children($widget) as $sub_key) {
+      if (isset($widget[$sub_key]['#type']) && $widget[$sub_key]['#type'] == 'submit') {
+        hide($widget[$sub_key]);
+        $operations_elements[] = &$widget[$sub_key];
+      }
+    }
+
+    // Delay rendering of the "Display" option and the weight selector, so that
+    // each can be rendered later in its own column.
+    if ($element['#display_field']) {
+      hide($widget['display']);
+    }
+    hide($widget['_weight']);
+
+    // Render everything else together in a column, without the normal wrappers.
+    $widget['#theme_wrappers'] = [];
+    $information = drupal_render($widget);
+    $display = '';
+    if ($element['#display_field']) {
+      unset($widget['display']['#title']);
+      $display = [
+        'data' => render($widget['display']),
+        'class' => ['checkbox'],
+      ];
+    }
+    $widget['_weight']['#attributes']['class'] = [$weight_class];
+    $weight = render($widget['_weight']);
+
+    // Arrange the row with all of the rendered columns.
+    $row = [];
+    $row[] = $information;
+    if ($element['#display_field']) {
+      $row[] = $display;
+    }
+    $row[] = $weight;
+
+    // Show the buttons that had previously been marked as hidden in this
+    // preprocess function. We use show() to undo the earlier hide().
+    foreach (Element::children($operations_elements) as $key) {
+      show($operations_elements[$key]);
+    }
+    $row[] = [
+      'data' => $operations_elements,
+    ];
+    $rows[] = [
+      'data' => $row,
+      'class' => isset($widget['#attributes']['class']) ? array_merge($widget['#attributes']['class'], ['draggable']) : ['draggable'],
+    ];
+  }
+
+  $variables['table'] = [
+    '#type' => 'table',
+    '#header' => $headers,
+    '#rows' => $rows,
+    '#attributes' => [
+      'id' => $table_id,
+    ],
+    '#tabledrag' => [
+      [
+        'action' => 'order',
+        'relationship' => 'sibling',
+        'group' => $weight_class,
+      ],
+    ],
+    '#access' => !empty($rows),
+  ];
+
+  $variables['element'] = $element;
+}
+
+/**
+ * Prepares variables for file upload help text templates.
+ *
+ * Default template: file-upload-help.html.twig.
+ *
+ * @param array $variables
+ *   An associative array containing:
+ *   - description: The normal description for this field, specified by the
+ *     user.
+ *   - upload_validators: An array of upload validators as used in
+ *     $element['#upload_validators'].
+ */
+function template_preprocess_file_upload_help(&$variables) {
+  $description = $variables['description'];
+  $upload_validators = $variables['upload_validators'];
+  $cardinality = $variables['cardinality'];
+
+  $descriptions = [];
+
+  if (!empty($description)) {
+    $descriptions[] = FieldFilteredMarkup::create($description);
+  }
+  if (isset($cardinality)) {
+    if ($cardinality == -1) {
+      $descriptions[] = t('Unlimited number of files can be uploaded to this field.');
+    }
+    else {
+      $descriptions[] = \Drupal::translation()->formatPlural($cardinality, 'One file only.', 'Maximum @count files.');
+    }
+  }
+  if (isset($upload_validators['file_validate_size'])) {
+    $descriptions[] = t('@size limit.', ['@size' => format_size($upload_validators['file_validate_size'][0])]);
+  }
+  if (isset($upload_validators['file_validate_extensions'])) {
+    $descriptions[] = t('Allowed types: @extensions.', ['@extensions' => $upload_validators['file_validate_extensions'][0]]);
+  }
+
+  if (isset($upload_validators['file_validate_image_resolution'])) {
+    $max = $upload_validators['file_validate_image_resolution'][0];
+    $min = $upload_validators['file_validate_image_resolution'][1];
+    if ($min && $max && $min == $max) {
+      $descriptions[] = t('Images must be exactly <strong>@size</strong> pixels.', ['@size' => $max]);
+    }
+    elseif ($min && $max) {
+      $descriptions[] = t('Images must be larger than <strong>@min</strong> pixels. Images larger than <strong>@max</strong> pixels will be resized.', ['@min' => $min, '@max' => $max]);
+    }
+    elseif ($min) {
+      $descriptions[] = t('Images must be larger than <strong>@min</strong> pixels.', ['@min' => $min]);
+    }
+    elseif ($max) {
+      $descriptions[] = t('Images larger than <strong>@max</strong> pixels will be resized.', ['@max' => $max]);
+    }
+  }
+
+  $variables['descriptions'] = $descriptions;
+}
+
+/**
+ * Determine whether a field references files stored in {file_managed}.
+ *
+ * @param \Drupal\Core\Field\FieldDefinitionInterface $field
+ *   A field definition.
+ *
+ * @return bool
+ *   The field column if the field references {file_managed}.fid, typically
+ *   fid, FALSE if it does not.
+ */
+function file_field_find_file_reference_column(FieldDefinitionInterface $field) {
+  $schema = $field->getFieldStorageDefinition()->getSchema();
+  foreach ($schema['foreign keys'] as $data) {
+    if ($data['table'] == 'file_managed') {
+      foreach ($data['columns'] as $field_column => $column) {
+        if ($column == 'fid') {
+          return $field_column;
+        }
+      }
+    }
+  }
+  return FALSE;
+}