This is done by adding a new field on mail.thread objects and setting it when posting a message with attachments on a model inheriting from mail.thread. Was part of PR #26740 Was part of task #1880089
This is done by adding a new field on mail.thread objects and setting it when posting a message with attachments on a model inheriting from mail.thread. Was part of PR #26740 Was part of task #1880089