Joseph is a well known man in the bible. He is also known as the dreamer. He has eleven elder brothers and him being the youngest son of Israel. His father loved him more than his brothers and even showed it that, he(his father) even got him a long coat of many colors.
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On his journey to greatness, he had a dream about him that he rose while his brothers bow for him and even his parents. He narrated the dream to his father and brothers. They started disliking him as from the moment knowing that he might be greater than them. He was sent to give them food on the farm while his brothers sold him to an israelite who took him as a slave. The eldest son was not happy with this decision but had to play along.
Joseph landed at Potiphar's house as as a slave who do the domestic house chores. He was tempted by Potiphar's wife but he fled from temptation. Potiphar's wife thought at this point that the only option left for her is to implicate Joseph and that led him to prison. He was punished for the offence he didn't commit.
He later became the second in command to the king of Egypt as at that time. He was in prison when the chief baker and chief butler of the king offended him. They were both put in prison where Joseph was. Let's check Genesis chapter 40 for its affirmation
Some time later, the cupbearer and the baker of the king of Egypt offended their master, the king of Egypt.
2 Pharaoh was angry with his two officials, the chief cupbearer and the chief baker,
3 and put them in custody in the house of the captain of the guard, in the same prison where Joseph was confined.
4 The captain of the guard assigned them to Joseph, and he attended them. After they had been in custody for some time,
5 each of the two men—the cupbearer and the baker of the king of Egypt, who were being held in prison—had a dream the same night, and each dream had a meaning of its own.
6 When Joseph came to them the next morning, he saw that they were dejected.
7 So he asked Pharaoh’s officials who were in custody with him in his master’s house, “Why do you look so sad today?”
8 “We both had dreams,” they answered, “but there is no one to interpret them.” Then Joseph said to them, “Do not interpretations belong to God? Tell me your dreams.”
9 So the chief cupbearer told Joseph his dream. He said to him, “In my dream I saw a vine in front of me,
10 and on the vine were three branches. As soon as it budded, it blossomed, and its clusters ripened into grapes.
11 Pharaoh’s cup was in my hand, and I took the grapes, squeezed them into Pharaoh’s cup and put the cup in his hand.”
12 “This is what it means,” Joseph said to him. “The three branches are three days.
13 Within three days Pharaoh will lift up your head and restore you to your position, and you will put Pharaoh’s cup in his hand, just as you used to do when you were his cupbearer.
14 But when all goes well with you, remember me and show me kindness; mention me to Pharaoh and get me out of this prison.
15 I was forcibly carried off from the land of the Hebrews, and even here I have done nothing to deserve being put in a dungeon.”
16 When the chief baker saw that Joseph had given a favorable interpretation, he said to Joseph, “I too had a dream: On my head were three baskets of bread.
17 In the top basket were all kinds of baked goods for Pharaoh, but the birds were eating them out of the basket on my head.”
18 “This is what it means,” Joseph said. “The three baskets are three days.
19 Within three days Pharaoh will lift off your head and impale your body on a pole. And the birds will eat away your flesh.”
20 Now the third day was Pharaoh’s birthday, and he gave a feast for all his officials. He lifted up the heads of the chief cupbearer and the chief baker in the presence of his officials:
21 He restored the chief cupbearer to his position, so that he once again put the cup into Pharaoh’s hand
22 but he impaled the chief baker, just as Joseph had said to them in his interpretation.
23 The chief cupbearer, however, did not remember Joseph; he forgot him.
In the above bible passage, both the Chief baker and cupbearer had a dream the same night and woke up looking sad. They narrated their dreams to Joseph and he interpreted it accordingly and it came to pass. But, he told the cupbearer to remember him after he's restored back but cupbearer did not remember him.
An incident that made the cupbearer remember him then happened when the king had a dream but none of the wise men could interpret it. Joseph interpreted the king's dream successfully which made him gained access to the seat of the second in command in the lamd of Egypt.
