forms.py

from django import forms

class Form1(forms.Form):
    
    arquivo = forms.FileField()

    def ler_conteudo_do_arquivo(self):
        return self.cleaned_data['arquivo'].read()


class Form2(forms.Form):
    
    texto = forms.TextField()

nome_do_template_form1.html

<form action="form_action" method="post">
<ul>
{{ form.as_ul }}
<input type="submit"/>
</ul>
</form>

nome_do_template_form2.html

<form action="" method="post">
<ul>
{{ form.as_ul }}
<input type="submit"/>
</ul>
</form>

views.py

from forms import Form1, Form2

def ler_arquivo(request):
    form_action = ''
    if request.method == 'POST':
        form = Form1(request.POST, request.FILES)
        if form.is_valid():
            form = Form2(initial={'texto': form.ler_conteudo_do_arquivo()})
            form_action = reverse('salvar_arquivo')
    else:
        form = Form1()
    return direct_to_template(request, "nome_do_template_form1.html", {'form': form, 'form_action': form_action})

def salvar_arquivo(request):
    if request.method == 'POST':
        form = Form2(request.POST)
        if form.is_valid():
            (faz o que quiser com o form)
    else:
        form = Form2()
    return direct_to_template(request, "nome_do_template_form2.html", {'form': form})