In AEM6.1 SP1 or SP2, when you select multiple assets in the /assets.html Touch UI interface, download option is missing in Card and List Views, however, it shows in Column View.
Apply AEM 6.1 Service Pack 2 and Cumulative Fix Pack 3 or later from here:
https://helpx.adobe.com/experience-manager/kb/aem61-available-hotfixes.html
Observação:
Before applying a Service Pack or Cumulative Fix Pack to production environments, test it thoroughly in lower environments.
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