I want to use btn1 to send a signal to the slot function of deviceTypeSelect, but btn1 can only be associated with QStackedWidget.

Why the widget btn1 in the subpage of QStackedWidget can only define signals for QStackedWidget, but not for page: deviceTypeSelect in QStackedWidget?
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There are two problems.
The first is conceptual: Designer cannot know anything about custom slots that are going to be implemented in a promoted widget, and it even should not. The connection to those slots can only be achieved programmatically, and that's for good reasons: Designer cannot "inspect" (nor it should) the source of the files that will be promoted, and it's also completely possible that one would promote a widget and use different classes with the same design files.
The other problem is technical: the "pages" of multipage widgets like QStackedWidget or QTabWidget cannot be used as signal targets on Designer. I don't know if it's just a missing feature or it's by design (knowing how multipage widget plugins are dealt with I wouldn't bet about the it), but unfortunately it really is not possible.
If you want to connect to standard QWidget slots (
setEnabled()etc.), set a dummy boxed layout on the page, and add another QWidget in it, but if you use custom slots, as explained before, those must be manually connected from your code.