Decide what needs to be kept
Choose the conversation and identify anything that must accompany it: source documents, images, or references. A saved conversation and the files originally attached to it are not necessarily the same thing.
Choose a file you can use
PDF suits reading and sharing. Markdown gives you editable text for notes. DOCX suits revision in Word. JSON provides structured data for processing. ChatShell supports these four formats for the current conversation.
Export and verify
Open ChatShell while viewing the conversation, select Current Chat and your format, then export. Open the downloaded file rather than checking only that a download appeared. Confirm the beginning and end are present and inspect any tables, code, formulas, or images that matter.
Make the copy easy to find
Give the file a topic and date, then place it in the relevant project folder. Keep source attachments alongside it when needed. If you need several conversations, use Pro batch export in HTML, Markdown, DOCX, or JSON and review the results for failed items.
A shared link is useful for access, but it is not a downloaded copy under your control. For records you need to retain, check that you can open the actual saved files independently.