If you are using Qlik Sense desktop, it is not possible to automatically reload data. This can only be done manually.
If you are using Qlik Sense Server, then in the QMC you would create a reload task. Open the QMC, select the Tasks option. From there at the bottom you can select 'create new'. This will allow you to define a scheduled task to automatically refresh your application.
Hope this helps.
"If you are using Qlik Sense desktop, it is not possible to automatically reload data."
Have a look at this thread.It seems that this can be done using batch scripts. I still need to work out how to do this
We ran into a similar problem at our end, for which we created batch scripts to run the QVW from Private edition to create qvds or csvs and store them in a dropbox folder and created a web file connection string in qlik sense.