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Question

HTML Editor and source code tab

  • June 5, 2026
  • 0 replies
  • 8 views

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We use a custom HTML template. For each block in this template, I created a universal block so we can reuse them in both campaigns and flows.

Since the new update today, I can no longer edit the universal blocks because Klaviyo seems to have removed the Source Code tab from the editor.

This means I can’t create emails anymore. Does anyone have any idea how to fix this?

Editor today:


Editor yesterday (with the source code tab)