Set vacume only

Have the vacuum and mop model.  Want to sometimes only vacume but always mops.  Should also vacume first than mop... otherwise just moves it around.  

You have to go to settings and set it up to vacuum, then mop..

I need help with the App, is there great video that explains all of the options in the App?  I have a Dreame GoVac 508 vacuum and mop.  Thanks for any help!