STEP carries geometry; PDF / DWG carry tolerances and datums. When rev letters disagree, the AI sketch is only a sketch — engineering asks before confirmation. Put the rev in the filename. One file ≤80 MB.
You can still preview with no login. Quantity 1 can re-upload. Target 12h UTC+8 to lock the new pack.
A drawing change restarts the lead-time clock. No implants. Do not reuse an old FAI on new geometry.
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