Missing flagged emails they are not showing up on ToDo app

[Jack0_0]

The whole point of flagging an email is so that you don't miss it. I set due dates on when I need to follow up on an email but now I'm noticing that there are some emails that are flagged but they don't show up on my ToDo. 

The image below shows one email that is flagged for August 16,2024 but on the Todo app it's not showing. Most of the flagged emails do show up but there are some that don't and it defeats the purpose of the app.

[#2]

I have the same problem. One day all my flagged emails where gone from the To Do list. Only 9 of about 50 where showing. All new flags are added to the To Do, but all old are not.

[#3]

So I just noticed that the flagged email that are not showing is because they are newly sent email, and when I moved them from my "Sent" folder to a different folder on my inbox they appear on the ToDo app. Does anyone know how to include the Sent folder in the ToDo app???