Once your unit is connected to the web app, select the Presets Manager tab. On the drop-down menu underneath, open it and select "All User Presets"
From there select "Import Presets" (which is circled below)
The Import Presets page will pop up. Once this happens, click "Select Files" and select the .xml file you'd like to import.
After this, select which preset(s) you'd like to import and click "Import Presets" at the bottom.
From there, the preset(s) will be loaded on the web app and your elevate unit.