diff --git a/modules/dgi_migrate_foxml_standard_mods/migrations/dgis_orig_file.yml b/modules/dgi_migrate_foxml_standard_mods/migrations/dgis_orig_file.yml
index f410b34..15f66b3 100644
--- a/modules/dgi_migrate_foxml_standard_mods/migrations/dgis_orig_file.yml
+++ b/modules/dgi_migrate_foxml_standard_mods/migrations/dgis_orig_file.yml
@@ -70,11 +70,6 @@ process:
     - plugin: dgi_migrate.method
       source: '@_latest'
       method: getUri
-  _path:
-    - plugin: format_date
-      source: '@created'
-      from_format: U
-      to_format: 'Y-m'
   filemime:
     - plugin: dgi_migrate.subproperty
       property: MIMETYPE
@@ -93,19 +88,12 @@ process:
         - '@_safe_pid'
         - '@_ext'
       delimiter: '.'
-  _dest_uri:
-    - plugin: concat
-      source:
-        - constants/file_dest
-        - '@_path'
-        - '@filename'
-      delimiter: '/'
   uri:
-    - plugin: dgi_migrate.naive_file_copy
-      file_exists: rename
-      source:
-        - '@_source_uri'
-        - '@_dest_uri'
+    - plugin: dgi_migrate.foxml_file
+      source: '@_source_uri'
+      destination: constants/file_dest
+      date: '@created'
+      filename: '@filename'
   filesize:
     - plugin: callback
       source: '@uri'
diff --git a/modules/dgi_migrate_foxml_standard_mods/migrations/dgis_tn_file.yml b/modules/dgi_migrate_foxml_standard_mods/migrations/dgis_tn_file.yml
index 25a5286..b2a5ef6 100644
--- a/modules/dgi_migrate_foxml_standard_mods/migrations/dgis_tn_file.yml
+++ b/modules/dgi_migrate_foxml_standard_mods/migrations/dgis_tn_file.yml
@@ -66,11 +66,6 @@ process:
     - plugin: dgi_migrate.method
       source: '@_latest'
       method: getUri
-#  _path:
-#    - plugin: format_date
-#      source: '@created'
-#      from_format: U
-#      to_format: 'Y-m'
   filemime:
     - plugin: dgi_migrate.subproperty
       property: MIMETYPE
@@ -89,22 +84,12 @@ process:
         - '@_safe_pid'
         - '@_ext'
       delimiter: '.'
-#  _dest_uri:
-#    - plugin: concat
-#      source:
-#        - constants/file_dest
-#        - '@_path'
-#        - '@filename'
-#      delimiter: '/'
-#  uri:
-#    - plugin: dgi_migrate.naive_file_copy
-#      file_exists: rename
-#      source:
-#        - '@_source_uri'
-#        - '@_dest_uri'
   uri:
     - plugin: dgi_migrate.foxml_file
-      pid:
+      source: '@_source_uri'
+      destination: constants/file_dest
+      date: '@created'
+      filename: '@filename'
   filesize:
     - plugin: callback
       source: '@uri'
diff --git a/src/Plugin/migrate/process/FoxmlFile.php b/src/Plugin/migrate/process/FoxmlFile.php
index 2908612..fc0119d 100644
--- a/src/Plugin/migrate/process/FoxmlFile.php
+++ b/src/Plugin/migrate/process/FoxmlFile.php
@@ -2,9 +2,8 @@
 
 namespace Drupal\dgi_migrate\Plugin\migrate\process;
 
-use Drupal\Component\Transliteration\TransliterationInterface;
-use Drupal\Core\Language\LanguageInterface;
 use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\MigrateSkipRowException;
 use Drupal\migrate\Plugin\MigrateProcessInterface;
 use Drupal\migrate\Plugin\MigrationInterface;
 use Drupal\migrate\ProcessPluginBase;
@@ -18,14 +17,11 @@
  * - method: One of "copy" (to copy the file) or "direct" (to directly use the
  *   file). Defaults to "copy". Can be set with the DGI_MIGRATE_FILE_METHOD
  *   environment variable.
- * - pid: Property in the row containing the PID, to build out a destination if
- *   copying.
  * - destination: Property in the row containing the destination, to build out
  *   a destination path if copying.
  * - date: Property in the row containing a date with which to build a path in
  *   the destination, when copying.
- * - mimetype; Property in the row containing the MIME type of the file, to
- *   determine an extension.
+ * - filename: Property in the row containing a filename.
  *
  * @MigrateProcessPlugin(
  *   id = "dgi_migrate.foxml_file"
@@ -41,9 +37,7 @@ public function __construct(
     $plugin_id,
     $plugin_definition,
     protected MigrationInterface $migration,
-    protected TransliterationInterface $transliteration,
     protected MigrateProcessInterface $naiveCopyPlugin,
-    protected MigrateProcessInterface $extensionPlugin,
   ) {
     parent::__construct($configuration, $plugin_id, $plugin_definition);
   }
@@ -61,9 +55,7 @@ public static function create(ContainerInterface $container, array $configuratio
       $plugin_id,
       $plugin_definition,
       $migration,
-      $container->get('transliteration'),
-      $process_plugin_manager->createInstance('dgi_migrate.naive_file_copy'),
-      $process_plugin_manager->createInstance('dgi_migrate.process.extension_from_mimetype'),
+      $process_plugin_manager->createInstance('dgi_migrate.naive_file_copy', [], $migration),
     );
   }
 
@@ -74,35 +66,45 @@ public function transform($value, MigrateExecutableInterface $migrate_executable
     return match ($this->configuration['method']) {
       'copy' => $this->naiveCopyPlugin->transform([
         $value,
-        $this->getDestinationPath($migrate_executable, $row, $destination_property),
+        $this->getDestinationPath($row),
       ], $migrate_executable, $row, $destination_property),
-      'direct' => $value,
+      'direct' => $this->ensureNonWritable($value),
     };
   }
 
   /**
    * Build out path.
    */
-  protected function getDestinationPath(MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) : string {
-    $pid = $row->get($this->configuration['pid']);
-    // Adapted from https://api.drupal.org/api/drupal/core%21modules%21migrate%21src%21Plugin%21migrate%21process%21MachineName.php/class/MachineName/10
-    $safe_pid = preg_replace(
-      '/_+/',
-      '_',
-      preg_replace(
-        '/[^a-z0-9_]+/',
-        '_',
-        strtolower(
-          $this->transliteration->transliterate($pid, LanguageInterface::LANGCODE_DEFAULT, '_'),
-        ),
-      )
-    );
-
+  protected function getDestinationPath(Row $row) : string {
     $dest_dir = $row->get($this->configuration['destination']);
     $path = date('Y-m', $row->get($this->configuration['date']));
-    $ext = $this->extensionPlugin->transform($row->get($this->configuration['mimetype']), $migrate_executable, $row, $destination_property);
+    $filename = $row->get($this->configuration['filename']);
+
+    return "{$dest_dir}/{$path}/{$filename}";
+  }
+
+  /**
+   * Helper; ensure the given path does not appear to be writable.
+   *
+   * @param string $path
+   *   The path to check.
+   *
+   * @return string
+   *   The path unchanged if non-writable; otherwise, we throw the skip
+   *   exception.
+   *
+   * @throws \Drupal\migrate\MigrateSkipRowException
+   *   If the file appears to be writable/deletable.
+   */
+  protected function ensureNonWritable(string $path) : string {
+    $file = new \SplFileInfo($path);
+
+    if ($file->isFile() && !$file->isDir() && $file->isReadable() && !$file->isWritable() &&
+      !$file->getPathInfo()->isWritable()) {
+      throw new MigrateSkipRowException('Source appears writable (or not readable); skipping row.');
+    }
 
-    return "{$dest_dir}/{$path}/{$safe_pid}.{$ext}";
+    return $path;
   }
 
 }