Step 1. To create a folder start by selecting "My Documents" from the mobile app.
Step 2. Select the Category and then Sub-category where your folder will saved.
Step 3. Select the plus button on the top-right of the screen and you will be prompted to enter a folder name. Once you enter the folder name select "Create".
You can now select that folder and begin uploading documents.
Please note, you cannot delete folders when signed in with the mobile app.