Export the whole chat, with media. In WhatsApp, export the conversation with Include media on Android or Attach Media on iPhone, so the photos travel with the text. Copy the export to your Windows PC and keep it as it arrived.
Keep the original export alongside the PDF. ThreadBind only reads the export folder; it never edits, renames or moves a file in it, and it refuses to save the PDF over the chat text or any file the chat refers to. Store the folder, or the zip it came in, next to the PDF. Whoever asked for the messages may want it too.
Check the dates before you export. Phones write dates in their own region's order, so 03/04 can be March 4 or April 3. ThreadBind works the order out from the dates in the file. When the dates cannot settle it, a Day first and Month first switch appears above the table, and the chat is read again with your choice.
Read the first page. The title block states the chat name, the number of messages, the first and last dates, the number of participants, and the time the PDF was made, with the name of the export it came from. That tells a reader exactly what period and source the document covers.
Look for what the export left out. If the chat mentions a file that is not in the export folder, the PDF says Missing file at that message and lists every missing file again at the end with its time. In an export made without media, each spot carries a note such as Media not included in the export.
Deleted and edited messages. WhatsApp writes a line where a message was deleted, and ThreadBind prints it as This message was deleted with its time and sender. Messages the export marks as edited carry an Edited note.
Page numbers for references. Every page carries the chat name and a number such as 7 / 31, so people can refer to a page and a date in a letter or a meeting.
Keep it private. A chat in a dispute is sensitive. ThreadBind makes no network connections and has no account, so the conversation never leaves your PC on its way to becoming a PDF.
Ask what else they want. Your lawyer or the other side may ask for the original export or the phone itself as well as the PDF. Keeping the export untouched makes either easy to provide.