I created a method for re-rendering PDFs and called it in write method after super() to update the pdf preview based on the value of a field. The problem is that while everything works as it should on my local machine, the live server shows nothing no error logs or pop-up messages and simply does not update the preview.

for display preview i'm using 

class="o_attachment_preview" options="{'preview_priority_type': 'pdf'}"/>

pdf update method 

def _pdf_preview_update(self):
    report_action = "user_detail_report"
    if report_action:
        report = self.env.ref(f'custom_module.{report_action}')
try:
            pdf = report._render_qweb_pdf(self.ids)
            data_record = base64.b64encode(pdf[0])
self.message_main_attachment_id.write({"datas": data_record})
except Exception as e:
            _logger.error(_(f"Failed to update pdf : {e}")


write method:

def write(self, vals):
    res = super(MrpBom, self).write(vals)
if self.message_main_attachment_id:
self._pdf_preview_update()
return res