In the user guide, I read the following:

5.4.2 Creating a Tasklist in a Folder Other Than the Tasklist Folder
You can create a Tasklist area in another folder and drag items to that area. After items are in a Tasklist area of any folder, they also display in the master Tasklist folder, even though they are still located in the original folder.
I can't successfully accomplish this. I have a series of shared folders with tasklist areas, and I would like tasks from those folders' tasklist areas to also show up in my master tasklist. "Show in tasklist" is checked off for all of them, but they only show up in the tasklist area of that specific folder. How can I fix this?