sharing a Photos album to Facebook

I figured it out. When you double-click a photo in an album, you get to view it full size, with the other photos visible as small thumbnails on the side. You can't select photos when using this view. You have to click the back button to see the full album in medium sized thumbnails which can then be selected per usual. You can also go to the View menu and choose Albums and then choose to open the album. Before doing anything else, you can select all the photos or some of them and post away. Thanks for the help - I knew it had to be a basic thing I was doing wrong.

Those instructions suggest you can select more than one photo. I am not able to select more than one photo. I want to select all of the photos in the album. I can't. While clicking, I've tried holding the shift button, the command button, the option button, the fn, the contol, etc. Nothing works. If I go to the main Photos view, I can select photos as expected. But if I am in an album, where the photo selected is big and the rest of the photos appear as thumbnails along the side, I can only select one photo at a time. How do I select all of the photos in an album?