Start by choosing Resources in the left bar. Inside the Resource tab, you will be able to select the folder or add a folder. You need to have a folder to add a resource.

Inside the folder, you will select 'Select Files' to add the file. You can add any PNG, JPG, GIF, or PDF to the folder.

Once you select the file you want to add to the folder, you will find it below the space to add a file.

Once a file is added, you have the ability to preview, rename, move, or delete a file as needed.