Excuse me: What is the meaning of "Fu Shang" in "Fu Shang Tangtian Word, Foucault Mian Bogao"?

In the Tang Dynasty, a local official got a rare swan. He wanted to please the emperor, so he sent someone to Kyoto to pay tribute to the swan.

The man sent is called Mian Bogao. He walked all the way, thinking, what is Kyoto like? It must be a big, big place. What is the palace like? It must be a very high palace. It was June, and the weather was very hot and the temperature was very high. Mian Bogao was careful all the way for fear of an accident. He wanted to dedicate the swan to the emperor, so he had to wash it beautifully. So he walked all the way to find a place with water, just passing by Mianyang Lake. He went to the lake to bathe the swan. The swan flapped its wings while calling. Accidentally, the swan flew away. He hurried to catch it, but the swan flew high and only a goose feather fell from the sky. Mian Bogao picked up this goose feather. I have no choice but to take this goose feather to see the emperor.

In the courtyard, Mian Bogao hands holding goose feather, said the situation along the road again, finally read a poem:

Paying tribute to geese in the Tang Dynasty is a long way to go.

Mian yang Lake got lost and fell to the ground crying.

As for the emperor of Tang Fu dynasty, you can go to Mian Bogao.

Gifts are light and affectionate, and goose feathers are sent thousands of miles away.

Seeing his honesty, the emperor left goose feathers and sent him back.

Later, people used the proverb "a thousand miles to send goose feathers" to illustrate that although the gift is meager, it has deep feelings.