Following on from vs Following up on

I just want to understand the difference between "Following up on & Following on from". Is it exactly the same meaning?

Here you have an example:

• Following on from your email below
• Following up on your email below

Is there any difference between them?

Thanks in advance.

"To follow on from something" means to happen after something, and often as the next part or stage of it (Macmillan):

• Following on from last year’s success, we’ll be offering other similar courses.
• What I’m going to say follows on from what Elizabeth was saying.

"To follow up on something" means (Merriam Webster) to do something in response to (something) : to take appropriate action about (something)

He says that the police failed to follow up on his complaints.

So, Following on from your email below would mean that you are continuing a chain of meaning or information, whereas Following up on your email below would mean that you are simply responding to that email.