diff --git a/.github/workflows/deploy-12.0.yml b/.github/workflows/deploy-12.0.yml
index 8dd0a2ac..9ab14529 100644
--- a/.github/workflows/deploy-12.0.yml
+++ b/.github/workflows/deploy-12.0.yml
@@ -3,7 +3,7 @@ name: Deploy CI - 12.0
 on:
   push:
     branches:
-      - master
+      - 12.0
 
 jobs:
   deploy:
@@ -19,4 +19,4 @@ jobs:
       - run: cd $GITHUB_WORKSPACE
       - run: git config user.name ci-bot
       - run: git config user.email ci-bot@seafile.com
-      - run: mike deploy --push -u 12.0 latest
+      - run: mike deploy --push -u 12.0
diff --git a/manual/extension/only_office.md b/manual/extension/only_office.md
index dd504a43..b301c978 100644
--- a/manual/extension/only_office.md
+++ b/manual/extension/only_office.md
@@ -45,7 +45,6 @@ ONLYOFFICE_APIJS_URL = 'https://seafile.example.com:6233/web-apps/apps/api/docum
 ONLYOFFICE_FILE_EXTENSION = ('doc', 'docx', 'ppt', 'pptx', 'xls', 'xlsx', 'odt', 'fodt', 'odp', 'fodp', 'ods', 'fods', 'csv', 'ppsx', 'pps')
 ONLYOFFICE_EDIT_FILE_EXTENSION = ('docx', 'pptx', 'xlsx')
 ONLYOFFICE_JWT_SECRET = '<your jwt secret>'
-OFFICE_PREVIEW_MAX_SIZE = 30 * 1024 * 1024 # preview size, 30 MB
 ```
 
 !!! tip
@@ -136,7 +135,6 @@ ENABLE_ONLYOFFICE = True
 ONLYOFFICE_APIJS_URL = 'http{s}://<Your OnlyOffice host url>/web-apps/apps/api/documents/api.js'
 ONLYOFFICE_FILE_EXTENSION = ('doc', 'docx', 'ppt', 'pptx', 'xls', 'xlsx', 'odt', 'fodt', 'odp', 'fodp', 'ods', 'fods', 'csv', 'ppsx', 'pps')
 ONLYOFFICE_JWT_SECRET = '<your jwt secret>'
-OFFICE_PREVIEW_MAX_SIZE = 30 * 1024 * 1024 # preview size, 30 MB
 ```
 
 ### About SSL