Is there a way to preprocess my .txt file before uploading to improve compatibility?

Yes, preprocessing your .txt file can often resolve upload issues. This includes removing unnecessary formatting (e.g., excessive whitespace, strange characters), ensuring consistent line endings (e.g., LF or CRLF), and correcting any encoding errors. You can use text editing software or scripting languages like Python to automate this preprocessing. Consider removing any potentially problematic HTML tags or special characters that might confuse the ChatGPT system.