diff --git a/resources/sql/autopatches/20220512.file.02.migrate.php b/resources/sql/autopatches/20220512.file.02.migrate.php
new file mode 100644
--- /dev/null
+++ b/resources/sql/autopatches/20220512.file.02.migrate.php
@@ -0,0 +1,52 @@
+<?php
+
+$attachment_table = new PhabricatorFileAttachment();
+$attachment_conn = $attachment_table->establishConnection('w');
+
+$src_cursor = '';
+$dst_cursor = '';
+
+while (true) {
+  $rows = queryfx_all(
+    $attachment_conn,
+    'SELECT src, dst, dateCreated FROM %T
+      WHERE type = 26 AND (src > %s OR (src = %s AND dst > %s))
+      ORDER BY src ASC, type ASC, dst ASC LIMIT %d',
+    'edge',
+    $src_cursor,
+    $src_cursor,
+    $dst_cursor,
+    10000);
+
+  if (!$rows) {
+    break;
+  }
+
+  $sql = array();
+  foreach ($rows as $row) {
+    $sql[] = qsprintf(
+      $attachment_conn,
+      '(%s, %s, %s, %ns, %d, %d)',
+      $row['dst'],
+      $row['src'],
+      PhabricatorFileAttachment::MODE_ATTACH,
+      null,
+      $row['dateCreated'],
+      $row['dateCreated']);
+  }
+
+  foreach (PhabricatorLiskDAO::chunkSQL($sql) as $chunk) {
+    queryfx(
+      $attachment_conn,
+      'INSERT IGNORE INTO %R
+        (objectPHID, filePHID, attachmentMode, attacherPHID,
+          dateCreated, dateModified)
+        VALUES %LQ',
+      $attachment_table,
+      $chunk);
+  }
+
+  $last = last($rows);
+  $src_cursor = $last['src'];
+  $dst_cursor = $last['dst'];
+}