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Estimados, tengo My Cloud y el problema es que no puedo visualizar los documentos en formato pdf_word_excel sin tener que descargarlos al computador.
Mi SO es MAC

Translation
Dear, I have My Cloud and the problem is that I can not visualize documents in format pdf_word_excel without having to download them to your computer. My OS is MAC

Are you accessing the My Cloud locally or remotely? If locally use Mac Finder to access the My Cloud. One can map the drive for easier access.

https://support.wdc.com/knowledgebase/answer.aspx?ID=2686

If you are accessing a remote My Cloud using MyCloud.com or one of the My Cloud programs or apps then that behavior, downloading the file prior to opening it, may be normal.