diff --git a/ietf/meeting/utils.py b/ietf/meeting/utils.py
index 470795811..e3d8c830e 100644
--- a/ietf/meeting/utils.py
+++ b/ietf/meeting/utils.py
@@ -727,7 +727,7 @@ def save_session_minutes_revision(session, file, ext, request, encoding=None, ap
 def handle_upload_file(file, filename, meeting, subdir, request=None, encoding=None):
     """Accept an uploaded materials file
 
-    This function takes a file object, a filename and a meeting object and subdir as string.
+    This function takes a _binary mode_ file object, a filename and a meeting object and subdir as string.
     It saves the file to the appropriate directory, get_materials_path() + subdir.
     If the file is a zip file, it creates a new directory in 'slides', which is the basename of the
     zip file and unzips the file in the new directory.
@@ -749,9 +749,18 @@ def handle_upload_file(file, filename, meeting, subdir, request=None, encoding=N
                 pass  # if the file is already gone, so be it
 
     with (path / filename).open('wb+') as destination:
+        # prep file for reading
+        if hasattr(file, "chunks"):
+            chunks = file.chunks()
+        else:
+            try:
+                file.seek(0)
+            except AttributeError:
+                pass
+            chunks = [file.read()]  # pretend we have chunks
+
         if filename.suffix in settings.MEETING_VALID_MIME_TYPE_EXTENSIONS['text/html']:
-            file.open()
-            text = file.read()
+            text = b"".join(chunks)
             if encoding:
                 try:
                     text = text.decode(encoding)
@@ -778,11 +787,8 @@ def handle_upload_file(file, filename, meeting, subdir, request=None, encoding=N
                                      f"please check the resulting content.  "
                                  ))
         else:
-            if hasattr(file, 'chunks'):
-                for chunk in file.chunks():
-                    destination.write(chunk)
-            else:
-                destination.write(file.read())
+            for chunk in chunks:
+                destination.write(chunk)
 
     # unzip zipfile
     if is_zipfile:
diff --git a/ietf/meeting/views.py b/ietf/meeting/views.py
index c3494a13b..cf7c67ac4 100644
--- a/ietf/meeting/views.py
+++ b/ietf/meeting/views.py
@@ -33,6 +33,7 @@ from django.conf import settings
 from django.contrib import messages
 from django.contrib.auth.decorators import login_required
 from django.core.exceptions import ValidationError
+from django.core.files.uploadedfile import SimpleUploadedFile
 from django.core.validators import URLValidator
 from django.urls import reverse,reverse_lazy
 from django.db.models import F, Max, Q
@@ -2795,6 +2796,17 @@ class UploadOrEnterAgendaForm(UploadAgendaForm):
         elif submission_method == "enter":
             require_field("content")
 
+    def get_file(self):
+        """Get content as a file-like object"""
+        if self.cleaned_data.get("submission_method") == "upload":
+            return self.cleaned_data["file"]
+        else:
+            return SimpleUploadedFile(
+                name="uploaded.md",
+                content=self.cleaned_data["content"].encode("utf-8"),
+                content_type="text/markdown;charset=utf-8",
+            )
+
 def upload_session_agenda(request, session_id, num):
     # num is redundant, but we're dragging it along an artifact of where we are in the current URL structure
     session = get_object_or_404(Session,pk=session_id)
@@ -2815,21 +2827,8 @@ def upload_session_agenda(request, session_id, num):
     if request.method == 'POST':
         form = UploadOrEnterAgendaForm(show_apply_to_all_checkbox,request.POST,request.FILES)
         if form.is_valid():
-            submission_method = form.cleaned_data['submission_method']
-            if submission_method == "upload":
-                file = request.FILES['file']
-                _, ext = os.path.splitext(file.name)
-            else:
-                if agenda_sp:
-                    doc = agenda_sp.document
-                    _, ext = os.path.splitext(doc.uploaded_filename)
-                else:
-                    ext = ".md"
-                fd, name = tempfile.mkstemp(suffix=ext, text=True)
-                os.close(fd)
-                with open(name, "w") as file:
-                    file.write(form.cleaned_data['content'])
-                file = open(name, "rb")
+            file = form.get_file()
+            _, ext = os.path.splitext(file.name)
             apply_to_all = session.type.slug == 'regular'
             if show_apply_to_all_checkbox:
                 apply_to_all = form.cleaned_data['apply_to_all']