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By saving and sending to someone files in eDrawings you can decide, whether this person will be able to make measurements in the file. This is an essential setting, because the ability to recreate a detail based on dimensions depends on it.
To allow measurement, you can enable this option in export settings (system Options) or select each time publishing to eDrawings Permission to measure this edrawings.
After publishing the icon Measure is active and you can take measurements.