Working With File Attachments

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Upload a File

Files up to 5MB in size that are attached to Slack messages will be synced to the Tightknit community site. They will appear as attachments on the corresponding post or comment.

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Blog Cover Images

For Feeds that are configured to display posts as “Blogs,” the cover image used is the first image file attachment on the Slack message, if any. Images added through Block Kit cannot be used as a cover image. See Images in Block Kit messages.

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Delete a File

If a file is attached to a message and the message is deleted in Slack, or the post/comment is removed from the Tightknit site using the message shortcut, the file is also deleted. You may also use the Delete file action in Slack. This action will only delete the file in Slack and in the Tightknit community site, and the post/comment will be preserved.

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Limitations

The following files or attachments are currently unsupported and will not be ingested by Tightknit:

• Snippets
• Slack Connect files
• Unfurled attachments, such as Google Drive files or Google Docs
• Files over 5MB
• Forwarded or shared Slack messages
• Files or images sent as blocks using Block Kit UI (see Images in Block Kit messages)

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Images in Block Kit messages

A message built with Block Kit can reference an image stored in Slack instead of attaching it to the message. This is common in messages sent from Slack Workflow Builder and from custom Slack apps. Slack serves those images only to signed-in members of your Slack workspace, so they cannot be shown to community site visitors. Tightknit hides the image rather than displaying a broken one, and the rest of the message renders as normal. The image is also unavailable as a blog cover image. To have an image appear on the community site, attach it to the Slack message as a file rather than adding it through Block Kit.