ALbum slide show

I use WM My cloud home to store pictures and videos.
Whem i’m viewing the albuns that i’ve created where is the option start slideshow ?
To do that i need to share the album, copy the link, paste it to a web browser, start the slide show in the web browser and after that start slideshow.
And should be possible to share the slide show of an algum in my chromecast . I don’t know how to do it in the app.

thank you in advance