Message attachments open through short-lived access links. A link copied from an earlier tab can stop working even when the attachment is still present in the conversation.
Return to Messages, open the original thread, and select the attachment chip again. That requests a fresh link using your current signed-in access. Use the new tab created by that action.
If the fresh attempt also fails, check your sign-in state and record the visible error. A link-expiry problem is different from a missing attachment chip, an inaccessible conversation, or a file that was removed from a deleted message.
When asking for help, provide the conversation subject, filename, and approximate message time. Avoid sending the expired private URL as the only description of the problem. If a colleague needs the file, arrange access through the appropriate workspace or ask the team for a suitable sharing method; forwarding a temporary URL does not create durable permission for another person.
Was this article helpful?
Tell us whether this answered the question you came with.