Sandisk connect wireless stick doubt

Is there another way to save files to the “sandisk connect wireless stick” without having the app.?

For example I found another wireless usb flash drive that includes an SDK to access the flash drive with 3rd party apps.

No as far as I have seen sandisk has not released an SDK for the wireless stick. 

Also there is a dedicated board for the wireless stick. if you have any more questions try posting there.