Upload to GeoGebra Materials
From GeoGebra Manual
There are two ways to upload a file to GeoGebra directly from GeoGebra. First one is using the Export Worksheet Dialog of the GeoGebra Desktop Version, second one is using the 
Share option in 
File Menu.
Note: This feature requires an active internet connection to work correctly.
In the first step GeoGebra is going to prepare your worksheet for upload, afterwards your browser should open up and load a website which leads you through the process of publishing your worksheet on GeoGebra Materials. More information about GeoGebra Materials and its usage can be found in this wiki section.
Note: You can cancel the uploading process at any time by closing the browser window.
