diff --git a/daqviewer/daqviewer.py b/daqviewer/daqviewer.py
index 8385886..95470a6 100644
--- a/daqviewer/daqviewer.py
+++ b/daqviewer/daqviewer.py
@@ -35,8 +35,8 @@ app.layout = html.Div([
             'textAlign': 'center',
             'margin': '10px'
         },
-        # Allow multiple files to be uploaded
-        multiple=True),
+        # Only upload one file
+        multiple=False),
     html.Div(id='output-data-upload'),
 ])
 
@@ -152,20 +152,16 @@ def parse_contents(contents, filename, date):
     return elements
 
 
-@app.callback([Output('output-data-upload', 'children')], [
+@app.callback(Output('output-data-upload', 'children'), [
     Input('upload-data', 'contents'),
     Input('upload-data', 'filename'),
     Input('upload-data', 'last_modified'),
 ])
-def update_output(contents, names, dates):
+def update_output(contents, name, date):
     if contents is not None:
-        children = [
-            parse_contents(c, n, d) for c, n, d in zip(contents, names, dates)
-        ]
-
-        return children
+        return parse_contents(contents, name, date)
     else:
-        return [html.Div([])]
+        return html.Div([])
 
 
 def main():