4lines Reviewer material · 1 October 2026

Production walkthrough

Light BIM + renders

Editable architectural plans, real floors and a shared 2D/3D viewer.

This edited walkthrough uses actual production screenshots and two fictional review projects. It is supporting QA material, not a continuous screen recording or evidence that every review case is complete.

Production QA walkthrough

3 min · English captions · No audio

Actual production screenshots · 1 Oct 2026 · Edited walkthrough. The 3D viewer shows model geometry; the separate AI render is illustrative and may differ from the model.

Open the MP4 directly

Shown in the walkthrough

  1. A private P1 viewer, with its floor surface visible in 3D.
  2. A wall added and saved to the account project from the widget.
  3. A stale-revision request rejected after the browser saved PB, preserving both floors.
  4. Fresh project calls denied after the owner revoked A1 access.
  5. An actual AI render generated from an anonymous draft before claim.
  6. The draft saved to an account using Save and continue with AI.
  7. Continued modelling on that saved project and its private viewer in the same chat.

The claim continuation changed the north wall from 20 cm to 22 cm, moving the saved project from revision 2 to 3. The change was restored at revision 4; a separate production database comparison confirmed that the complete document matched its pre-edit state. The screenshot montage does not replay those transactions.

How to read this evidence

  • Captures show actual production UI and results. They have been fitted to the video frame without replacing or reconstructing their contents.
  • The cloud QA app connection shown in ChatGPT is separate from the submitted public package. This walkthrough does not claim that every installed-package review case has passed.
  • Project access requires OAuth and explicit owner permission. Current consent remains active until revoked; older timed permissions retain their original expiration.

The render was produced before the draft was claimed. It is a visual interpretation, not proof of exact geometry or private-project rendering. Render availability depends on the server capabilities and the selected plan.