I've pulled the following excerpt from the "My To-Do" page on the Wrike help center:
My to-do is a smart folder in Wrike that is created automatically in your Personal space when you join an account. It contains:
All tasks and subtasks that are assigned to you
Tasks that you manually added to My to-do
Tasks with file approvals to which you have been added as an approver
Note the last bullet point there stating that "My to-do" contains "Tasks with file approvals to which you have been added as an approver"
If the intention behind "My to-do" is to provide an aggregated list of tasks for which the user is responsible, it stands to reason that tasks with approvals to which the user has been added should show up in the list.
But in reality, only tasks with approvals that have a file attached appear to be shown in the list. I can't think of any reason why approvals without files attached should not be shown in the list. My team sees this as a major oversight, and the lack of consistency makes the "Approvals" feature unpredictable at best, and useless at worst.