Evaluating a Proposed Modification to a Sequential Processing Model

A Transformer model is adapted to compress a long text by processing it sequentially in segments. Arrange the following steps to accurately describe how this model iteratively builds a complete representation of the text.

When a Transformer model is fine-tuned to compress a long context by sequentially processing text segments, it updates a memory state at each step. What is the most critical function of incorporating the memory state from the previous step when encoding the current text segment?