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How can I force an update on the thumbnail and doc title? Slack doesn't seem to do periodic re-checks since the first time it cached the info. I've tried the command "refresh" the file, but does not work. This is in Team Drive, btw.

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Got it! I tried this from RayB, and it helped: https://webapps.stackexchange.com/a/140932

  • went to my test channel
  • posted the Google Doc link
  • chose "delete file from Slack" from its menu
  • reposted the link
  • Voilà! it posted with the new title and thumbnail
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