Hi,

You have a Binary field (e.g., file upload), and when users download the file, it's always downloaded as a .zip file even if you originally uploaded a PDF, DOCX, XLSX, etc.

To preserve the original file format, you must set the filename in a separate field and bind it to the binary field using the filename attribute in the form view.

1. Define a filename field in your model:

from odoo import models, fields

class MyModel(models.Model):

    _name = 'my.model'

    attachment = fields.Binary(string="File")

    attachment_filename = fields.Char(string="Filename")

2. In the view (form.xml):

<field name="attachment" filename="attachment_filename"/>

This tells Odoo to download the binary content using the value in attachment_filename.

Hope it helps