Traceback on the ticket: https://pastebin.com/mCAFJVWG A browse should take an id or a list of ids as parameter. ```python record = env['mail.compose.message'].browse(1) attachments = env['ir.attachment'].sudo().browse(record.attachment_ids) print(attachments) attachments = env['ir.attachment'].sudo().browse(record.attachment_ids.ids) print(attachments) ``` OPW-2728748 closes odoo/odoo#82664 X-original-commit: 74cfe2bc95827b52232995cd075757f54041d289 Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>