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This is 2026.9 preview documentation. Coverage here is incremental: a page exists only where 2026.9 differs or is newly documented.
When a workspace moves to the 2026.9 data model, ACC sync and drag-and-drop uploads write the new format by default. If a script, report, or other tool still expects the old format, that connection can break. Compatibility mode keeps those uploads in the old format while you update the downstream tool. For ACC hub setup that does not change, see Enable Autodesk Forma Data Management integration. For the user-facing migration steps, see Speckle’s data model is changing.
Compatibility mode is a temporary bridge. It is available until 1 November 2026. It is not a freeze of desktop connectors, and it does not pause ordinary publish and load.

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When to request it

Request compatibility mode when all of the following are true:
  • The workspace uses ACC sync or drag-and-drop uploads.
  • Something downstream of Speckle depends on the old data format.
  • You cannot update that downstream tool before the workspace starts writing the new format.
Do not request it only because connectors are still on an older release. Connector upgrades have their own window. See Plan the connector upgrade window.

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As a workspace admin

Identify whether any project uses ACC sync or drag-and-drop, and whether any script, custom report, or other tool reads that data in the old format. If it does, ask Speckle to switch the workspace into compatibility mode before 1 November 2026. After Speckle confirms the workspace is in compatibility mode, ACC sync and drag-and-drop continue to write the old format until you migrate off, or until 1 November 2026, whichever comes first. Contact Speckle in-app, through speckle.community/help, or via your Customer Success Advisor.

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As an IT administrator

Compatibility mode does not change ACC hub enablement, firewall allowlists, or connector installers. Keep using the IT Setup Guide for those tasks. Find ACC sync and drag-and-drop consumers before 1 November 2026, and treat compatibility mode as a dated exception, not as the long-term estate position.

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After 1 November 2026

Speckle no longer offers compatibility mode after this date. New ACC sync and drag-and-drop uploads then use the new data format. Downstream tools that still expect the old format can break until they are updated. Existing models stay readable. Desktop connector publish and load are not turned off by this date.

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FAQ

No. Compatibility mode is only for ACC sync and drag-and-drop uploads when another tool still expects the old format. See Who should pay closer attention.
No. Request it only when a script, custom report, or other tool depends on the old format and you cannot update that tool in time.
Ask Speckle to switch the workspace. Use in-app chat, speckle.community/help, or your Customer Success Advisor. Wait until Speckle confirms the workspace is in compatibility mode.
Compatibility mode is no longer available. New ACC sync and drag-and-drop uploads use the new format. Downstream tools that still expect the old format can break until you update them.
Last modified on September 2, 2026