Hello
Thank you for helping me
How can I log to delete or add files?

Please click the attachment icon available in chatter section.
Then you can see delete option.

Thanks, but that's not what I meant.
I actually want to know what code can be used to view the track history of attachment file in log note(step 5)

Hi that is customization, not standard odoo.

if current_rec_id:
if res.name in ['image_1024', 'image_1920', 'image_512', 'image_256', 'image_128']:
if res.mimetype and res.mimetype.startswith('image'):
# Skip preparing the body if the uploaded file is an image
continue
current_rec_id.message_post(body="{0} Added an attachment {1}".format(self.env.user.name, res.name))

Which model should I add this code to?

ir.attachment

i use
class bvIrAttachment(models.Model):
_inherit = ['ir.attachment', 'mail.thread']
but i am error
As you inherited?