3MF asset files can open successfully while still losing important data. The archival handoff check should look beyond file validity to units, hierarchy, animation, metadata, and external dependencies.
For 3MF asset, separate source, working, and delivery files. Use stable names for nodes and dependencies, remove unused references, and include a manifest that explains what the downstream user actually needs.
Include an open interchange format, source application version, checksums, dependencies, preview, and a short readme. Apply this archival handoff guidance to the actual 3MF asset delivery path.