How to make soft bread?

When making steamed stuffed buns, yeast powder and sugar are dissolved in warm water, and then yeast water is slowly added to the flour to knead into dough. After the dough is fermented for 1 hour, take out the dough, knead it into long strips and cut into small pieces, roll it into thin skin, put the stuffing into the thin skin and knead the edges to form the shape of steamed buns. Put the steamed bread in a steamer and ferment for another 20 minutes. After cooking, take it out to cool.