diff --git a/passerelle/apps/litteralis/models.py b/passerelle/apps/litteralis/models.py
index 75d72aca..1747b1f2 100644
--- a/passerelle/apps/litteralis/models.py
+++ b/passerelle/apps/litteralis/models.py
@@ -83,6 +83,23 @@ class Litteralis(BaseResource, HTTPResource):
 
         return resp.text
 
+    def _upload(self, url, post_data):
+        try:
+            file_byte_content = base64.b64decode(post_data['file']['content'])
+        except (TypeError, binascii.Error):
+            raise APIError("Can't decode file")
+
+        files = {
+            'file': (post_data['file']['filename'], file_byte_content, post_data['file']['content_type'])
+        }
+        return {
+            'data': self._call(
+                url,
+                method='post',
+                files=files,
+            )
+        }
+
     @endpoint(
         name='demandes-recues',
         description=_('Create submission'),
@@ -130,32 +147,35 @@ class Litteralis(BaseResource, HTTPResource):
 
     @endpoint(
         name='upload',
-        description=_('Upload file'),
+        description=_('Upload summary file'),
         perm='can_access',
         post={
             'request_body': {
                 'schema': {
-                    'application/json': schemas.UPLOAD,
+                    'application/json': schemas.UPLOAD_ANNEXES,
                 }
             }
         },
     )
     def upload(self, request, post_data):
-        try:
-            file_byte_content = base64.b64decode(post_data['file']['content'])
-        except (TypeError, binascii.Error):
-            raise APIError("Can't decode file")
+        url = 'demandes-recues/%s/upload' % post_data['id_demande']
+        return self._upload(url, post_data)
 
-        files = {
-            'file': (post_data['file']['filename'], file_byte_content, post_data['file']['content_type'])
-        }
-        return {
-            'data': self._call(
-                'demandes-recues/%s/upload' % post_data['id_demande'],
-                method='post',
-                files=files,
-            )
-        }
+    @endpoint(
+        name='annexes',
+        description=_('Upload appendix file'),
+        perm='can_access',
+        post={
+            'request_body': {
+                'schema': {
+                    'application/json': schemas.UPLOAD_ANNEXES,
+                }
+            }
+        },
+    )
+    def annexes(self, request, post_data):
+        url = 'demandes-recues/%s/annexes' % post_data['id_demande']
+        return self._upload(url, post_data)
 
     @endpoint(
         methods=['get'],
diff --git a/passerelle/apps/litteralis/schemas.py b/passerelle/apps/litteralis/schemas.py
index fef90666..67abfbe6 100644
--- a/passerelle/apps/litteralis/schemas.py
+++ b/passerelle/apps/litteralis/schemas.py
@@ -150,7 +150,7 @@ DEMANDES_RECUES = {
     'unflatten': True,
 }
 
-UPLOAD = {
+UPLOAD_ANNEXES = {
     '$schema': 'http://json-schema.org/draft-04/schema#',
     'type': 'object',
     'additionalProperties': False,
diff --git a/tests/test_litteralis.py b/tests/test_litteralis.py
index 79bcc508..ed707def 100644
--- a/tests/test_litteralis.py
+++ b/tests/test_litteralis.py
@@ -126,6 +126,25 @@ def test_upload(app, connector):
         assert json_resp['data'] == ''
 
 
+def test_annexes(app, connector):
+    params = {
+        'file': {
+            'filename': 'bla',
+            'content': base64.b64encode(b'who what').decode(),
+            'content_type': 'text/plain',
+        },
+        'id_demande': '1234',
+    }
+    with responses.RequestsMock() as rsps:
+        rsps.post('http://litteralis.invalid/demandes-recues/1234/annexes', status=200, body='')
+        resp = app.post_json('/litteralis/slug-litteralis/annexes', params=params)
+        assert len(rsps.calls) == 1
+        assert rsps.calls[0].request.headers['Content-Type'].startswith('multipart/form-data')
+        json_resp = resp.json
+        assert json_resp['err'] == 0
+        assert json_resp['data'] == ''
+
+
 def test_demandes_recues_reponses(app, connector):
     with responses.RequestsMock() as rsps:
         rsps.get('http://litteralis.invalid/demandes-recues/1234/reponses', status=200, json={'foo': 'bar'})