You are able to upload the files using the ‘Files’ page. Click ‘Files’ link on right top in the ‘Profile’ page. You could get below screen. You can select the file type to upload and click on the bottom link ‘Click/Drop files here to upload’. Then select the file to upload from your local machine and the file should be updated.
All uploaded files will lists under the box. You will able to download the files later from the lists.