How do you do an on-the-fly model update? (DS5.0)

How do you do an on-the-fly model update?

I’m using deepstream-app.
I tried replacing the engine file with another one, but it didn’t update.
(The parameters are the same.)

• Jetson Nano
• DeepStream 5.0
• JetPack 4.4
• TensorRT 7

Currently the feature is supported in deepstream-test5, please refer test5 README.