diff --git a/app/controllers/dmsf_upload_controller.rb b/app/controllers/dmsf_upload_controller.rb
index 2515b47a..b2590f23 100644
--- a/app/controllers/dmsf_upload_controller.rb
+++ b/app/controllers/dmsf_upload_controller.rb
@@ -132,7 +132,6 @@ class DmsfUploadController < ApplicationController
 
   def commit_files_internal(commited_files)
     @files, failed_uploads = DmsfUploadHelper.commit_files_internal(commited_files, @project, @folder, self)
-    call_hook(:dmsf_upload_controller_after_commit, { files: @files })
     respond_to do |format|
       format.js
       format.api  { render_validation_errors(failed_uploads) unless failed_uploads.empty? }
diff --git a/app/models/dmsf_file.rb b/app/models/dmsf_file.rb
index 28ff9a8b..38c39748 100644
--- a/app/models/dmsf_file.rb
+++ b/app/models/dmsf_file.rb
@@ -524,7 +524,7 @@ class DmsfFile < ActiveRecord::Base
       RedmineDmsf::Preview.generate last_revision&.disk_file.to_s, target
     rescue => e
       Rails.logger.error "An error occurred while generating preview for #{last_revision&.disk_file} to #{target}\nException was: #{e.message}"
-      ''
+      nil
     end
   end
 
diff --git a/app/views/dmsf/_main.html.erb b/app/views/dmsf/_main.html.erb
index 2f32e0c0..923748ca 100644
--- a/app/views/dmsf/_main.html.erb
+++ b/app/views/dmsf/_main.html.erb
@@ -130,7 +130,3 @@
     });
   <% end %>
 <% end %>
-
-<% late_javascript_tag do %>
-  "$('#ajax-indicator').hide();"
-<% end %>
diff --git a/app/views/dmsf_upload/upload_files.html.erb b/app/views/dmsf_upload/upload_files.html.erb
index d0a7dfc4..7af56843 100644
--- a/app/views/dmsf_upload/upload_files.html.erb
+++ b/app/views/dmsf_upload/upload_files.html.erb
@@ -45,8 +45,7 @@
       <% end %>
     <% end %>
     <div class="form-actions">
-      <%= submit_tag l(:label_upload), class: 'button-positive',
-                     onclick: "$('#ajax-indicator').show();" %>
+      <%= submit_tag l(:label_upload), class: 'button-positive' %>
     </div>
   <% end %>
 <% end %>
diff --git a/progress.patch b/progress.patch
deleted file mode 100644
index a985f6c0..00000000
--- a/progress.patch
+++ /dev/null
@@ -1,38 +0,0 @@
-diff --git a/app/controllers/dmsf_upload_controller.rb b/app/controllers/dmsf_upload_controller.rb
-index b2590f2..2515b47 100644
---- a/app/controllers/dmsf_upload_controller.rb
-+++ b/app/controllers/dmsf_upload_controller.rb
-@@ -132,6 +132,7 @@ class DmsfUploadController < ApplicationController
- 
-   def commit_files_internal(commited_files)
-     @files, failed_uploads = DmsfUploadHelper.commit_files_internal(commited_files, @project, @folder, self)
-+    call_hook(:dmsf_upload_controller_after_commit, { files: @files })
-     respond_to do |format|
-       format.js
-       format.api  { render_validation_errors(failed_uploads) unless failed_uploads.empty? }
-diff --git a/app/views/dmsf/_main.html.erb b/app/views/dmsf/_main.html.erb
-index 923748c..2f32e0c 100644
---- a/app/views/dmsf/_main.html.erb
-+++ b/app/views/dmsf/_main.html.erb
-@@ -130,3 +130,7 @@
-     });
-   <% end %>
- <% end %>
-+
-+<% late_javascript_tag do %>
-+  "$('#ajax-indicator').hide();"
-+<% end %>
-diff --git a/app/views/dmsf_upload/upload_files.html.erb b/app/views/dmsf_upload/upload_files.html.erb
-index 7af5684..d0a7dfc 100644
---- a/app/views/dmsf_upload/upload_files.html.erb
-+++ b/app/views/dmsf_upload/upload_files.html.erb
-@@ -45,7 +45,8 @@
-       <% end %>
-     <% end %>
-     <div class="form-actions">
--      <%= submit_tag l(:label_upload), class: 'button-positive' %>
-+      <%= submit_tag l(:label_upload), class: 'button-positive',
-+                     onclick: "$('#ajax-indicator').show();" %>
-     </div>
-   <% end %>
- <% end %>