icloud drive is not loaded on my El Capitan 10.11.6 Macbook Pro. Says 'There was a problem loading this content'

Greetings to you bycoastalcafe, 

Let’s begin isolating this situation by using the steps below. 

1. First, please test while connected to a different Wi-Fi network. 
2. Next, if you use any VPN software, be sure that is disabled. 
3. Then, boot to safe mode and see if the same message appears. How to use safe mode on your Mac

Intel processor

1. Turn on or restart your Mac, then immediately press and hold the Shift key as your Mac starts up.

2. Release the key when you see the login window, then log in to your Mac. 

3. You might be asked to log in again. On either the first or second login window, you should see ”Safe Boot” in the upper-right corner of the window.

Thanks.