diff --git a/app/models/metadata_file.rb b/app/models/metadata_file.rb
index 942b448d..fa570ac0 100644
--- a/app/models/metadata_file.rb
+++ b/app/models/metadata_file.rb
@@ -68,7 +68,7 @@ class MetadataFile < MetadataTemplate
       when ActionDispatch::Http::UploadedFile
         site.static_files.last if site.static_files.attach(value['path'])
       when String
-        if (blob_id = ActiveStorage::Blob.where(key: key_from_path).pluck(:id).first)
+        if (blob_id = ActiveStorage::Blob.where(key: key_from_path, service_name: site.name).pluck(:id).first)
           site.static_files.find_by(blob_id: blob_id)
         elsif path? && pathname.exist? && site.static_files.attach(io: pathname.open, filename: pathname.basename)
           site.static_files.last.tap do |s|
diff --git a/db/migrate/20220712135053_change_blob_key_uniqueness_to_include_service_name.rb b/db/migrate/20220712135053_change_blob_key_uniqueness_to_include_service_name.rb
new file mode 100644
index 00000000..00bae7ea
--- /dev/null
+++ b/db/migrate/20220712135053_change_blob_key_uniqueness_to_include_service_name.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+# Cambia el índice único para incluir el nombre del servicio, de forma
+# que podamos tener varias copias del mismo sitio (por ejemplo para
+# test) sin que falle la creación de archivos.
+class ChangeBlobKeyUniquenessToIncludeServiceName < ActiveRecord::Migration[6.1]
+  def change
+    remove_index :active_storage_blobs, %i[key], unique: true
+    add_index :active_storage_blobs, %i[key service_name], unique: true
+  end
+end