Why doesn't django render forms on the server?

Question

Django

A simple file upload page, everything works locally, but as soon as I upload it to the server, it does not display the file selection button.
Local

Server


views

from django.views.generic.edit import FormView
from .forms import FileFieldForm
from django.shortcuts import render
from django.conf import settings
from django.core.files.storage import FileSystemStorage
import paramiko
import glob
import os
from .models import Analiticks

class FileFieldView(FormView):
    form_class = FileFieldForm
    template_name = 'mainpage/upload.html'
    success_url = 'analize' 

    def post(self, request, *args, **kwargs):
        form_class = self.get_form_class()
        form = self.get_form(form_class)
        files = request.FILES.getlist('attachments')
        if form.is_valid():
            filesystem = FileSystemStorage()
            for f in files:
                pass
                filename = filesystem.save(f.name, f)
            return self.form_valid(form)
        else:
            return self.form_invalid(form)

forms

class FileFieldForm(forms.Form):
    attachments = forms.FileField(widget=forms.ClearableFileInput(attrs={'multiple': True}))

upload.html

<form enctype="multipart/form-data" method="post">
    {% csrf_token %}
    {{ form.attachments }}
    <button type="submit">Анализировать</button>
</form>