diff --git a/helpdesk/tests/test_api.py b/helpdesk/tests/test_api.py
index 0a0dedfe..ab9a146c 100644
--- a/helpdesk/tests/test_api.py
+++ b/helpdesk/tests/test_api.py
@@ -1,8 +1,11 @@
 import base64
+from collections import OrderedDict
 from datetime import datetime
 
+from django.core.files.uploadedfile import SimpleUploadedFile
+from freezegun import freeze_time
+
 from django.contrib.auth.models import User
-from pytz import UTC
 from rest_framework import HTTP_HEADER_ENCODING
 from rest_framework.exceptions import ErrorDetail
 from rest_framework.status import HTTP_200_OK, HTTP_201_CREATED, HTTP_204_NO_CONTENT, HTTP_400_BAD_REQUEST, HTTP_403_FORBIDDEN
@@ -72,6 +75,7 @@ class TicketTest(APITestCase):
         self.assertEqual(created_ticket.description, 'Test description\nMulti lines')
         self.assertEqual(created_ticket.submitter_email, 'test@mail.com')
         self.assertEqual(created_ticket.priority, 4)
+        self.assertEqual(created_ticket.followup_set.count(), 1)
 
     def test_create_api_ticket_with_basic_auth(self):
         username = 'admin'
@@ -178,6 +182,7 @@ class TicketTest(APITestCase):
         self.assertEqual(response.status_code, HTTP_204_NO_CONTENT)
         self.assertFalse(Ticket.objects.exists())
 
+    @freeze_time('2022-06-30 23:09:44')
     def test_create_api_ticket_with_custom_fields(self):
         # Create custom fields
         for field_type, field_display in CustomField.DATA_TYPE_CHOICES:
@@ -247,6 +252,19 @@ class TicketTest(APITestCase):
             'priority': 4,
             'due_date': None,
             'merged_to': None,
+            'followup_set': [OrderedDict([
+                ('id', 1),
+                ('ticket', 1),
+                ('date', '2022-06-30T23:09:44'),
+                ('title', 'Ticket Opened'),
+                ('comment', 'Test description\nMulti lines'),
+                ('public', True),
+                ('user', 1),
+                ('new_status', None),
+                ('message_id', None),
+                ('time_spent', None),
+                ('followupattachment_set', [])
+            ])],
             'custom_varchar': 'test',
             'custom_text': 'multi\nline',
             'custom_integer': 1,
@@ -262,3 +280,54 @@ class TicketTest(APITestCase):
             'custom_slug': 'test-slug'
         })
 
+    def test_create_api_ticket_with_attachment(self):
+        staff_user = User.objects.create_user(username='test', is_staff=True)
+        self.client.force_authenticate(staff_user)
+        test_file = SimpleUploadedFile('file.jpg', b'file_content', content_type='image/jpg')
+        response = self.client.post('/api/tickets/', {
+            'queue': self.queue.id,
+            'title': 'Test title',
+            'description': 'Test description\nMulti lines',
+            'submitter_email': 'test@mail.com',
+            'priority': 4,
+            'attachment': test_file
+        })
+        self.assertEqual(response.status_code, HTTP_201_CREATED)
+        created_ticket = Ticket.objects.get()
+        self.assertEqual(created_ticket.title, 'Test title')
+        self.assertEqual(created_ticket.description, 'Test description\nMulti lines')
+        self.assertEqual(created_ticket.submitter_email, 'test@mail.com')
+        self.assertEqual(created_ticket.priority, 4)
+        self.assertEqual(created_ticket.followup_set.count(), 1)
+        self.assertEqual(created_ticket.followup_set.get().followupattachment_set.count(), 1)
+        attachment = created_ticket.followup_set.get().followupattachment_set.get()
+        self.assertEqual(
+            attachment.file.name,
+            f'helpdesk/attachments/test-queue-1-{created_ticket.secret_key}/1/file.jpg'
+        )
+
+    def test_create_follow_up_with_attachments(self):
+        staff_user = User.objects.create_user(username='test', is_staff=True)
+        self.client.force_authenticate(staff_user)
+        ticket = Ticket.objects.create(queue=self.queue, title='Test')
+        test_file_1 = SimpleUploadedFile('file.jpg', b'file_content', content_type='image/jpg')
+        test_file_2 = SimpleUploadedFile('doc.pdf', b'Doc content', content_type='application/pdf')
+
+        response = self.client.post('/api/followups/', {
+            'ticket': ticket.id,
+            'title': 'Test',
+            'comment': 'Test answer\nMulti lines',
+            'attachments': [
+                test_file_1,
+                test_file_2
+            ]
+        })
+        self.assertEqual(response.status_code, HTTP_201_CREATED)
+        created_followup = ticket.followup_set.last()
+        self.assertEqual(created_followup.title, 'Test')
+        self.assertEqual(created_followup.comment, 'Test answer\nMulti lines')
+        self.assertEqual(created_followup.followupattachment_set.count(), 2)
+        self.assertEqual(created_followup.followupattachment_set.first().filename, 'doc.pdf')
+        self.assertEqual(created_followup.followupattachment_set.first().mime_type, 'application/pdf')
+        self.assertEqual(created_followup.followupattachment_set.last().filename, 'file.jpg')
+        self.assertEqual(created_followup.followupattachment_set.last().mime_type, 'image/jpg')
diff --git a/requirements-testing.txt b/requirements-testing.txt
index db93a92f..c07a8ced 100644
--- a/requirements-testing.txt
+++ b/requirements-testing.txt
@@ -5,3 +5,4 @@ coverage
 argparse
 pbr
 mock
+freezegun