diff --git a/evidence/forms.py b/evidence/forms.py
index 0ac251f..a2c0020 100644
--- a/evidence/forms.py
+++ b/evidence/forms.py
@@ -15,7 +15,7 @@ from utils.save_snapshots import move_json, save_in_disk
 class UploadForm(forms.Form):
     evidence_file = MultipleFileField(label=_("File"))
 
-    def clean(self):
+    def clean_evidence_file(self):
         self.evidences = []
         data = self.cleaned_data.get('evidence_file')
         if not data:
diff --git a/evidence/templates/upload.html b/evidence/templates/upload.html
index 2a76b76..6337b3e 100644
--- a/evidence/templates/upload.html
+++ b/evidence/templates/upload.html
@@ -8,22 +8,20 @@
   </div>
 </div>
 
+<!-- override invalid-feedback class -->
+<style>
+  .invalid-feedback {
+    color: #670000; 
+    font-size: 1rem; 
+  }
+  </style>
+
 {% load django_bootstrap5 %}
 <form role="form" method="post" enctype="multipart/form-data">
 {% csrf_token %}
-{% if form.errors %}
-<div class="alert alert-danger alert-icon alert-icon-border alert-dismissible" role="alert">
-    <div class="icon"><span class="mdi mdi-close-circle-o"></span></div>
-    <div class="message">
-      {% for error in form.non_field_errors %}
-        {{ error }}<br />
-      {% endfor %}
-      <button class="btn-close" type="button" data-dismiss="alert" aria-label="Close"></button>
-    </div>
-  </div>
-{% endif %}
-{% bootstrap_form form alert_error_type="fields" %}
-  <div class="form-actions-no-box">
+
+{% bootstrap_form form alert_error_type="none" error_css_class="alert alert-danger alert-icon alert-icon-border" %}
+      <div class="form-actions-no-box">
   <a class="btn btn-grey"       href="{% url 'dashboard:unassigned_devices' %}">{% translate "Cancel" %}</a>
   <input class="btn btn-green-admin" type="submit" name="submit" value="{% translate 'Save' %}" />
 </div>