If you want to free up more storage space, you can delete unused presentations but leave assets in your account, it cannot solve the problem. You have to delete the asset one by one since we do not support multiple asset delete. That's why we roll out this new feature, you can browse all the unused assets and delete them by one click only. You can check
here. (Don't worry, click this link will not delete unused asset immediately, it will let you preview first)
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VCASMO, Chief Developer
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