issues with multiple files. needs revision. See issue #528

smash/web/forms/study_subject_forms.py

@@ -89,7 +89,7 @@ def create_field_for_custom_study_subject_field(study_subject_field: CustomStudy
             required=study_subject_field.required,
             disabled=study_subject_field.readonly,
             initial=initial,
-            widget=SecuredFileWidget(attrs={'multiple': True})
+            widget=SecuredFileWidget() #TO DO: how to allow multiple files?
         )
     else:
         raise NotImplementedError