Final answer:
When assets are added to an existing creative, the updates will be reflected within the ads where the creatives are assigned.
Step-by-step explanation:
When assets are added to an existing creative, the updates will be reflected within the ads where the creatives are assigned. This means that any changes or updates made to the creative will appear in the ads where they have been assigned. Future ad creative assignments will also reflect these updates, but currently assigned ads will not be affected. The updates will not appear as a new creative either, but rather be reflected directly within the assigned ads.