via Computer to Shared Photos Album

Step 1: Download your photos to your computer OR
Open your OWN Google Photos.

Step 2: Click the Shared Album Link: 

(Link included in email to protect privacy.)

Step 3: Click "Join Album"

Step 4: Then it will look like this:

You will see your Google Profile in one of the Circles. 

In this example, we can see "T" for Troop and "D" for Denise. 

Step 5: Choose which method to upload photos.

Method 1 - Select from pictures already in YOUR Google Photos. 

Method 2 - Select from Downloaded Photos on Desktop

On the UPPER RIGHT of the screen.