ChatGPT is unable to fully load the data in the attached file

I am attempting to use My GPT to create my own GPT, with the hope that it can answer questions based on the content of the Markdown file I provide. However, during testing, I noticed that each time I ask a question, the GPT only loads part of the Markdown file, resulting in answers that often do not meet expectations. The Markdown text I uploaded is only 300k in size and consists of 1,000 lines. How can I ensure that the GPT fully reads the text I provide before answering questions?