The visualisations will just update....
I asked the QMC admin to refresh the data of an App which takes about 10min while I was on the app going back and forth between several sheets. At the end of the 10min process moving from one sheet to the other became a tad slower and I could see the numbers changing, that was it! Two months of data were added and the charts just got updated
I hope this helps,
PS we have QS June 2017