diff --git a/attachment_minio/migrations/13.0.0.0.1/post-migration.py b/attachment_minio/migrations/13.0.0.0.1/post-migration.py
new file mode 100644
index 00000000..fefe6dbf
--- /dev/null
+++ b/attachment_minio/migrations/13.0.0.0.1/post-migration.py
@@ -0,0 +1,60 @@
+# Copyright 2020 Hibou Corp.
+# Copyright 2016-2019 Camptocamp SA
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html)
+
+import logging
+
+from contextlib import closing
+
+import odoo
+
+_logger = logging.getLogger(__name__)
+
+
+def migrate(cr, version):
+    if not version:
+        return
+    cr.execute("""
+        SELECT value FROM ir_config_parameter
+        WHERE key = 'ir_attachment.location'
+    """)
+    row = cr.fetchone()
+
+    if row[0] == 's3':
+        uid = odoo.SUPERUSER_ID
+        registry = odoo.modules.registry.RegistryManager.get(cr.dbname)
+        new_cr = registry.cursor()
+        with closing(new_cr):
+            with odoo.api.Environment.manage():
+                env = odoo.api.Environment(new_cr, uid, {})
+                store_local = env['ir.attachment'].search(
+                    [('store_fname', '=like', 's3://%'),
+                     '|', ('res_model', '=', 'ir.ui.view'),
+                          ('res_field', 'in', ['image_small',
+                                               'image_medium',
+                                               'web_icon_data'])
+                     ],
+                )
+
+                _logger.info(
+                    'Moving %d attachments from S3 to DB for fast access',
+                    len(store_local)
+                )
+                for attachment_id in store_local.ids:
+                    # force re-storing the document, will move
+                    # it from the object storage to the database
+
+                    # This is a trick to avoid having the 'datas' function
+                    # fields computed for every attachment on each
+                    # iteration of the loop.  The former issue being that
+                    # it reads the content of the file of ALL the
+                    # attachments on each loop.
+                    try:
+                        env.clear()
+                        attachment = env['ir.attachment'].browse(attachment_id)
+                        _logger.info('Moving attachment %s (id: %s)',
+                                     attachment.name, attachment.id)
+                        attachment.write({'datas': attachment.datas})
+                        new_cr.commit()
+                    except:
+                        new_cr.rollback()