diff --git a/app/services/whatsapp/incoming_message_notificame_service.rb b/app/services/whatsapp/incoming_message_notificame_service.rb
index 5d4b25a..b9181fc 100644
--- a/app/services/whatsapp/incoming_message_notificame_service.rb
+++ b/app/services/whatsapp/incoming_message_notificame_service.rb
@@ -305,7 +305,7 @@ def attach_file(message, content)
 
     message.attachments.new(
       file_type: file_content_type(file_type_key),
-      fallback_title: (File.basename(URI.parse(content[:fileUrl].to_s).path) rescue File.basename(content[:fileUrl].to_s)).presence,
+      fallback_title: content[:fileName].presence || (File.basename(URI.parse(content[:fileUrl].to_s).path) rescue File.basename(content[:fileUrl].to_s)).presence,
       file: { io: io, filename: File.basename(io.path), content_type: mime_type }
     )
 
diff --git a/spec/services/whatsapp/incoming_message_notificame_service_spec.rb b/spec/services/whatsapp/incoming_message_notificame_service_spec.rb
new file mode 100644
index 0000000..ce22973
--- /dev/null
+++ b/spec/services/whatsapp/incoming_message_notificame_service_spec.rb
@@ -0,0 +1,78 @@
+# frozen_string_literal: true
+
+begin
+  require 'rails_helper'
+rescue LoadError
+  RSpec.describe 'Whatsapp::IncomingMessageNotificameService' do
+    it 'has service spec scaffold ready' do
+      skip 'rails_helper is not available in this workspace snapshot'
+    end
+  end
+end
+
+return unless defined?(Rails)
+
+RSpec.describe Whatsapp::IncomingMessageNotificameService do
+  describe '#attach_file fallback_title resolution' do
+    let(:provider_service) { instance_double('Whatsapp::Providers::NotificameService') }
+    let(:channel) { instance_double(Channel::Whatsapp, provider_service: provider_service) }
+    let(:inbox) { instance_double(Inbox, channel: channel) }
+    let(:service) { described_class.new(inbox: inbox, params: {}) }
+
+    let(:attachments_collection) { instance_double('ActiveRecord::Associations::CollectionProxy') }
+    let(:message) { instance_double(Message, attachments: attachments_collection) }
+
+    let(:download_response) do
+      instance_double('HTTParty::Response', success?: true, body: "\x25PDF-1.4\x00".b, code: 200)
+    end
+
+    before do
+      allow(provider_service).to receive(:download_media).and_return(download_response)
+      allow(service).to receive(:file_content_type).and_return(:file)
+    end
+
+    it 'uses content[:fileName] when present in the payload' do
+      content = {
+        fileMimeType: 'application/pdf',
+        fileUrl: 'https://cdn.notificame/abc123def',
+        fileName: 'relatorio-q2.pdf'
+      }
+
+      expect(attachments_collection).to receive(:new) do |args|
+        expect(args[:fallback_title]).to eq('relatorio-q2.pdf')
+        expect(args[:file]).to include(content_type: 'application/pdf')
+        expect(args[:file][:io]).to respond_to(:read)
+        expect(args[:file][:filename]).to be_a(String).and(be_present)
+      end
+
+      service.send(:attach_file, message, content)
+    end
+
+    it 'falls back to URL basename when content[:fileName] is missing' do
+      content = {
+        fileMimeType: 'application/pdf',
+        fileUrl: 'https://cdn.notificame/files/manual.pdf'
+      }
+
+      expect(attachments_collection).to receive(:new) do |args|
+        expect(args[:fallback_title]).to eq('manual.pdf')
+      end
+
+      service.send(:attach_file, message, content)
+    end
+
+    it 'falls back to URL basename when content[:fileName] is blank' do
+      content = {
+        fileMimeType: 'application/pdf',
+        fileUrl: 'https://cdn.notificame/files/manual.pdf',
+        fileName: ''
+      }
+
+      expect(attachments_collection).to receive(:new) do |args|
+        expect(args[:fallback_title]).to eq('manual.pdf')
+      end
+
+      service.send(:attach_file, message, content)
+    end
+  end
+end