diff --git a/longs/models.py b/longs/models.py
index c5558cc0..19d9cfd1 100644
--- a/longs/models.py
+++ b/longs/models.py
@@ -285,6 +285,27 @@ class LongSeries(models.Model):
             "<div>{}<br/>{}<br/>Images: {}</div>", examination, thumb, image_number
         )
 
+    def order_by_upload_filename(self):
+        images = self.images.all()
+
+        filenames = []
+        map = []
+
+        for i in images:
+            filenames.append((i, i.upload_filename))
+            map[i.upload_filename] = i
+
+        filenames = sorted(filenames)
+
+        n = 1
+        for f in filenames:
+            i = map[f]
+            i.position = n
+            i.save()
+            n = n + 1
+        
+
+
     def order_by_dicom_location(self):
         images = self.images.all()
 
diff --git a/longs/templates/longs/long_series_viewer.html b/longs/templates/longs/long_series_viewer.html
index 24acf325..9d5df5cf 100755
--- a/longs/templates/longs/long_series_viewer.html
+++ b/longs/templates/longs/long_series_viewer.html
@@ -14,6 +14,8 @@ This series is not associated with any cases.
 
 <div>Author: {{ series.get_author_display }}</div>
 
+<a href="{% url 'longs:long_series_order_dicom' pk=long.pk %}" title="orders dicom by slice location">Order dicoms</a> 
+<a href="{% url 'longs:long_series_order_upload_filename' pk=long.pk %}" title="orders dicom by slice location">Order by uploaded filename</a> 
 {% for image in series.images.all %}
     {{image.image.url}}, pos: {{image.position}}, {{image.upload_filename}}</br>
     
diff --git a/longs/urls.py b/longs/urls.py
index 7252f3f6..0487e8d8 100755
--- a/longs/urls.py
+++ b/longs/urls.py
@@ -12,6 +12,7 @@ urlpatterns = [
     path("series/", views.LongSeriesView.as_view(), name="long_series_view"),
     path("series/<int:pk>", views.long_series_detail, name="long_series_detail"),
     path("series/<int:pk>/order_dicom", views.long_series_order_dicom, name="long_series_order_dicom"),
+    path("series/<int:pk>/order_upload_filename", views.long_series_order_upload_filename, name="long_series_order_upload_filename"),
     path("series/<int:pk>/delete", views.LongSeriesDelete.as_view(), name="long_series_delete"),
     # path("unchecked/", views.unchecked_list, name="unchecked_list"),
     # path("verified/<int:pk>/", views.verified_detail, name="verified_detail"),
diff --git a/longs/views.py b/longs/views.py
index b47b0f8d..91d60f91 100755
--- a/longs/views.py
+++ b/longs/views.py
@@ -940,4 +940,11 @@ def long_series_order_dicom(request, pk):
 
     return redirect("longs:long_series_detail", pk=pk)
 
+@login_required
+def long_series_order_upload_filename(request, pk):
+    series = get_object_or_404(LongSeries, pk=pk)
+    series.order_by_upload_filename()
+
+    return redirect("longs:long_series_detail", pk=pk)
+
 LongExamViews = ExamViews(Exam, Long, "longs", "long", loadJsonAnswer)
\ No newline at end of file