Third-party control issues

How do I bind the app with a third-party smart speaker to voice-control devices?

The devices cannot be controlled with the iPhone via Siri and Apple HomePod?

Can I use Siri and Apple HomePod to control smart products?

How do I link a third-party smart speaker to the App?

Why does "Incorrect username or password" display when I register an account and bind a skill/action?

How to display devices and scenes in the Watch version of the App?

Cannot connect the device in the Google?

How do I unbind the Amazon Alexa App account from Echo Show?

Can I directly connect my devices to a third-party smart speaker?

JD Dingdong failed to control the device, how can I add my device to JD Dingdong again?