[Python] how to update / replace a file in a Django FileField()

I have a Django model that holds a file like so:

class Excel(models.Model):
the_generated_file = models.FileField()


I know want to access this file with an updated version of the file. If this was a int, foat or Json field etc I could use something like:

File_to_update = Excel.objects.all()
File_to_update.update(the_generated_file = my_new_excel_previously_defined)


But for some reason as it is of type FiledField() there is no update operation. How can I replace the old file with a new file?

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