Select Resources.

Select the Resources tool from the Tool Menu of your site.
Select Actions, then Choose Upload Files.

- To the right of the folder to which you want to add files, select the Actions dropdown menu.
- Choose Upload Files.
If you have not created any folders yet, use the site's root folder (bearing the name of the site) to add files.
Drag and drop files from your computer.

Drag files from your computer and drop them in the box labeled Drop files to upload, or click here to browse.
This will display thumbnails of the files that will be uploaded (as shown in the image above).
Or browse your computer for files.

Alternatively, select the Drop files to upload, or click here to browse button. This will open your computer's Finder or Explorer window where you can browse for and select the file.
Select Continue.

Select Continue to upload the file.
File displays in Resources.

The file is now located inside the selected Resources folder.