This guide explains how to edit an existing keyframe on an object.
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Open the Template and click Open Template Editor.
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In the Layers panel, select the object with the keyframe you want to edit.
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On the Timeline, move the playhead to the existing keyframe (shown as a diamond marker on the object's track) that you want to edit.
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In the Attributes panel, expand the attribute group containing the keyframed property.
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Update the property's value and/or its Transition Time.
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Press “Save”.
More information can be found Template Editor