diff --git a/migrate_json_example/migrate_json_example.install b/migrate_json_example/migrate_json_example.install
index b10e368d3029329bb13ac6e0b763e2a8f80d8e2b..86171fe4d96a08772e86020a3a5a73536c8c6bf7 100644
--- a/migrate_json_example/migrate_json_example.install
+++ b/migrate_json_example/migrate_json_example.install
@@ -5,16 +5,32 @@
  * Install, update, and uninstall functions for migrate_json_example.
  */
 
+use Drupal\Core\File\FileSystemInterface;
+
 /**
  * Copies the example file to the sites/default/files folder.
  */
 function migrate_json_example_install() {
   // Create the example file directory and ensure it's writable.
   $directory = file_default_scheme() . '://migrate_json_example';
-  file_prepare_directory($directory, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS);
+  // TODO: remove after 8.6 is no longer supported in
+  // https://www.drupal.org/project/migrate_plus/issues/3035587
+  if (version_compare(\Drupal::VERSION, '8.7', '>=')) {
+    \Drupal::service('file_system')->prepareDirectory($directory, FileSystemInterface::CREATE_DIRECTORY | FileSystemInterface::MODIFY_PERMISSIONS);
+  }
+  else {
+    file_prepare_directory($directory, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS);
+  }
 
   // Copy the example file to example directory.
   $module_path = drupal_get_path('module', 'migrate_json_example');
   $file_source = $module_path . '/artifacts/products.json';
-  file_unmanaged_copy($file_source, $directory . '/products.json', FILE_EXISTS_REPLACE);
+  // TODO: remove after 8.6 is no longer supported in
+  // https://www.drupal.org/project/migrate_plus/issues/3035587
+  if (version_compare(\Drupal::VERSION, '8.7', '>=')) {
+    \Drupal::service('file_system')->copy($file_source, $directory . '/products.json', FileSystemInterface::EXISTS_REPLACE);
+  }
+  else {
+    file_unmanaged_copy($file_source, $directory . '/products.json', FILE_EXISTS_REPLACE);
+  }
 }
diff --git a/src/Plugin/migrate/process/FileBlob.php b/src/Plugin/migrate/process/FileBlob.php
index 22341b6bc6ab6643fc11c0b1b3ef387079ff08d2..1d4aa1828274776f3ad552aa747c2b196181dd18 100644
--- a/src/Plugin/migrate/process/FileBlob.php
+++ b/src/Plugin/migrate/process/FileBlob.php
@@ -78,7 +78,15 @@ class FileBlob extends ProcessPluginBase implements ContainerFactoryPluginInterf
       return $destination;
     }
     $dir = $this->getDirectory($destination);
-    if (!file_prepare_directory($dir, FILE_CREATE_DIRECTORY)) {
+    // TODO: remove after 8.6 is no longer supported in
+    // https://www.drupal.org/project/migrate_plus/issues/3035587
+    if (version_compare(\Drupal::VERSION, '8.7', '>=')) {
+      $success = $this->fileSystem->prepareDirectory($dir, FileSystemInterface::CREATE_DIRECTORY | FileSystemInterface::MODIFY_PERMISSIONS);
+      if (!$success) {
+        throw new MigrateSkipProcessException("Could not create directory '$dir'");
+      }
+    }
+    elseif (file_prepare_directory($dir, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS)) {
       throw new MigrateSkipProcessException("Could not create directory '$dir'");
     }
     if ($this->putFile($destination, $blob, $replace)) {
@@ -95,14 +103,26 @@ class FileBlob extends ProcessPluginBase implements ContainerFactoryPluginInterf
    * @param string $blob
    *   The base64 encoded file contents.
    * @param int $replace
-   *   (optional) FILE_EXISTS_REPLACE (default) or FILE_EXISTS_ERROR, depending
-   *   on the configuration.
+   *   (optional) either FileSystemInterface::EXISTS_REPLACE; (default) or
+   *   FileSystemInterface::EXISTS_ERROR, depending on the configuration.
    *
    * @return bool|string
    *   File path on success, FALSE on failure.
    */
-  protected function putFile($destination, $blob, $replace = FILE_EXISTS_REPLACE) {
-    if ($path = file_destination($destination, $replace)) {
+  protected function putFile($destination, $blob, $replace = FileSystemInterface::EXISTS_REPLACE) {
+    // TODO: remove after 8.6 is no longer supported in
+    // https://www.drupal.org/project/migrate_plus/issues/3035587
+    if (!isset($replace)) {
+      $replace = FILE_EXISTS_REPLACE;
+    }
+    if (version_compare(\Drupal::VERSION, '8.7', '>=')) {
+      $path = $this->fileSystem->getDestinationFilename($destination, $replace);
+    }
+    else {
+      $path = file_destination($destination, $replace);
+    }
+
+    if ($path) {
       if (file_put_contents($path, $blob)) {
         return $path;
       }
@@ -119,15 +139,28 @@ class FileBlob extends ProcessPluginBase implements ContainerFactoryPluginInterf
    * Determines how to handle file conflicts.
    *
    * @return int
-   *   Either FILE_EXISTS_REPLACE (default) or FILE_EXISTS_ERROR, depending on
-   *   the configuration.
+   *   Either FileSystemInterface::EXISTS_REPLACE; (default) or
+   *   FileSystemInterface::EXISTS_ERROR, depending on the configuration.
    */
   protected function getOverwriteMode() {
-    if (!empty($this->configuration['reuse'])) {
-      return FILE_EXISTS_ERROR;
+    // TODO: remove after 8.6 is no longer supported in
+    // https://www.drupal.org/project/migrate_plus/issues/3035587
+    if (isset($this->configuration['reuse']) && !empty($this->configuration['reuse'])) {
+      if (version_compare(\Drupal::VERSION, '8.7', '>=')) {
+        return FileSystemInterface::EXISTS_ERROR;
+      }
+      else {
+        return FILE_EXISTS_ERROR;
+      }
+
     }
 
-    return FILE_EXISTS_REPLACE;
+    if (version_compare(\Drupal::VERSION, '8.7', '>=')) {
+      return FileSystemInterface::EXISTS_REPLACE;
+    }
+    else {
+      return FILE_EXISTS_REPLACE;
+    }
   }
 
   /**
diff --git a/tests/src/Kernel/Plugin/migrate/process/FileBlobTest.php b/tests/src/Kernel/Plugin/migrate/process/FileBlobTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..531e2e8a478edefdc218a5aa1e84cc168b1277c9
--- /dev/null
+++ b/tests/src/Kernel/Plugin/migrate/process/FileBlobTest.php
@@ -0,0 +1,233 @@
+<?php
+
+namespace Drupal\Tests\migrate_plus\Kernel\Plugin\migrate\process;
+
+use Drupal\Core\File\FileSystemInterface;
+use Drupal\KernelTests\KernelTestBase;
+use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\Row;
+use Drupal\Tests\user\Traits\UserCreationTrait;
+
+/**
+ * Tests the file_blob plugin.
+ *
+ * @coversDefaultClass \Drupal\migrate_plus\Plugin\migrate\process\FileBlob
+ * @group migrate_plus
+ */
+class FileBlobTest extends KernelTestBase {
+
+  use UserCreationTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = [
+    'migrate',
+    'migrate_plus',
+    'system',
+  ];
+
+  /**
+   * The process plugin manager.
+   *
+   * @var \Drupal\migrate\Plugin\MigratePluginManagerInterface
+   */
+  protected $pluginManager;
+
+  /**
+   * The blob representation of a cat image.
+   *
+   * @var string
+   */
+  protected $blob;
+
+  /**
+   * The sha1sum of the blob.
+   *
+   * @var string
+   */
+  protected $sha1sum;
+
+  /**
+   * The filesystem interface.
+   *
+   * @var \Drupal\Core\File\FileSystemInterface
+   */
+  protected $filesystem;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $this->pluginManager = $this->container->get('plugin.manager.migrate.process');
+    $this->filesystem = $this->container->get('file_system');
+    $this->sha1sum = 'a8eb2b9a987cfda507356d884f0498289bd0f620';
+    $this->blob = <<<EOT
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+EOT;
+  }
+
+  /**
+   * Tests file creation.
+   *
+   * @covers ::transform
+   */
+  public function testFileCreation() {
+    /** @var \Drupal\migrate\MigrateExecutableInterface $executable */
+    $executable = $this->prophesize(MigrateExecutableInterface::class)->reveal();
+    $row = new Row([], []);
+    $value = ['public://cat.jpeg', base64_decode($this->blob, TRUE)];
+    /** @var \Drupal\migrate_plus\Plugin\migrate\process\FileBlob $file_blob */
+    $file_blob = $this->pluginManager->createInstance('file_blob');
+    $file = $file_blob->transform($value, $executable, $row, 'destination_property');
+    $this->assertEquals('public://cat.jpeg', $file);
+    $this->assertEquals($this->sha1sum, sha1_file($file));
+    // TODO: remove after 8.6 is no longer supported in
+    // https://www.drupal.org/project/migrate_plus/issues/3035587
+    if (version_compare(\Drupal::VERSION, '8.7', '>=')) {
+      $configuration = [
+        'reuse' => FileSystemInterface::EXISTS_ERROR,
+      ];
+    }
+    else {
+      $configuration = [
+        'reuse' => FILE_EXISTS_ERROR,
+      ];
+    }
+    /** @var \Drupal\migrate_plus\Plugin\migrate\process\FileBlob $file_blob */
+    $file_blob = $this->pluginManager->createInstance('file_blob', $configuration);
+    /** @var \Drupal\migrate\MigrateExecutableInterface $executable */
+    $file = $file_blob->transform($value, $executable, $row, 'destination_property');
+    $this->assertEquals('public://cat.jpeg', $file);
+    $this->assertEquals($this->sha1sum, sha1_file($file));
+  }
+
+}