ModelChoiceField returns a number instead of its value

Question

I have a simple model for my csv files:

#models.py
class csvModel(models.Model):
    csvFileName = models.CharField(max_length=50)
    csvFile = models.FileField(upload_to='tpData/csv/')

My script allows a user to upload a file

Then, I use a ModelChoiceField that allows a user to select one of the uploaded file:

#forms.py
class convertForm(forms.Form):
    fileToConvert = forms.ModelChoiceField(queryset=csvModel.objects.all(), label="Choose a CSV file to convert")

When calling is_valid() I can access the value of the ModelChoiceField (e.g. if my csv file is named test1 I will get test1)

#forms.py
def clean_fileToConvert(self):
    print(self.cleaned_data.get("fileToConvert"))  #I get the name of the field (what I want)

But when I try to access this value just below the is_valid() , I obtain a number (e.g. 48 for a file, 49 for the following etc.)

#views.py
form2 = convertForm(request.POST)
    if form2.is_valid():
        print(request.POST.get("fileToConvert")) #I get 48

I even tried to return self.cleaned_data.get("fileToConvert") in the clean function but it does not work, I don't know how to access to the selected file name, url etc.