So like many people, I use Mac OS Photos app to keep a local copy of the photos and do some local editing and library management, and upload select pictures to Google Photos so that I can share. If you use iPhoto or Aperture to manage your photos and videos, upgrade to the Photos app. Access all of your photos from anywhere iCloud Photos automatically keeps all your photos in iCloud, so you can access them on your iPhone, iPad, iPod touch, Apple TV, Mac, iCloud.com, or on a PC. To download your Facebook photos and albums, launch the app and log into Facebook through the panel on the left. In just a few seconds, you'll see all of your stuff. Simply click ' Download ' and save to your desired destination (see image below).

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If you use iPhoto or Aperture to manage your photos and videos, upgrade to the Photos app. Access all of your photos from anywhere iCloud Photos automatically keeps all your photos in iCloud, so you can access them on your iPhone, iPad, iPod touch, Apple TV, Mac, iCloud.com, or on a PC.

Google launched Google Photos in 2015. Since then many amateur photographers like me have been using it either as their primary or secondary photo sharing tool. One the whole, Google Photos is great! It's unlimited storage (high quality; you have to pay extra to store originals), ease of sharing and AI-powered search alone make it a useful tool.

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Apple also replaced it mature but old iPhoto software with Photos.app in 2015. While it brings modern design and better performance to the table, its rough edges are still showing up such as limited photo sharing capabilities. Apple offers their own photo sharing options via iCloud photo stream and iCloud photo library, but for various reasons that you can read elsewhere they leave a lot to be desired at least as of this writing.

Google Photos is not in the share menu in Mac OS, so you cannot share an album easily from Photos.app to Google Photos. Even if there was a share extension, I'm not sure if we'd be limited by the arbitrary implementation snafus such as 30 photos at-a-time uploads that Flickr sharing has.
Google's photo backup utility isn't really designed for manual uploads. In typical Google fashion, it's an all or none option. It insists on automatically uploading all your photos unless you carefully restrict it to a folder.
You can't drag and drop photos from Photos.app to Google Photos website uploader. To upload photos, you have to use the upload button on photos.google.com and select the 'Photos' Media folder from the sidebar that appears in the Finder window, then select the album you want.
If you have painstakingly bothered adding Title and Description to your photos, it will be lost using the method above.

Alright. Now that you know the problems, you want to know the solution too right? You didn't read this far just to hear me complain, did you? Of course not. So following is the workflow that works for me.

The Workflow

Create an album in Photos.app. Edit away to your heart's content. I recommend using the 'description' field if you want to add some info, but if you happened to make use of 'title', fear not, I have a fix for it too.
Select all the photos you want to upload, then use the export feature of Photos app as shown in the screenshot below. Remember to create a new folder in the finder window shown in next step after you click 'Export'.
Use Google Photos website's upload feature to upload these exported photos.
Delete the folder of exported photos.

If you have 'title' for photos instead of 'description', Google Photos loses them in the upload process. Instead of manually going through each photo and copying the title to description, you can use a nifty Mac OS feature called the 'Automator'. Automator is a somewhat old tool that Apple still supports on Mac OS X to let us do some app scripting. This is awesome, as it allows us to fix many of the annoyances and bugs that Apple left behind because they didn't make the cut. It also allows us to let your computer do what it loves to do, repetitive boring tasks.

'Copy titles to description' Automator service

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Fire up Automator and create a new 'Service' as shown in the screenshots below. Services are programs that can run in a given context (such as an application) and show up in the 'Services' menu of your app.
Remember to restrict the service to Photos app by selecting it in the dropdown.
Add a 'Run Applescript' action and copy-paste the Applescript code in text area. Save the service.
Launch Photos app and make sure it appears in the Services menu as shown below.
Select some photos and run the service, and behold your shiny glorious descriptions! You can use a mix of photos which have titles and ones that don't. The service will silently skip the photos without titles.
On a fairly typical middle-aged MacBook Pro with solid state storage, the service took me ~ 3 minutes to run on ~ 400 photos. Your run-time may vary.

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So there you go. Until Apple and Google both fix their products, hope this helps you. If you weren't familiar with Automator and Applescript, hope this opens some new doors for your weekend programming activities.

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