You have the option to share your photos and videos from Google Photos with other apps on Android and iOS using the photo picker. This feature allows you to select backed-up images and videos without granting the third-party app access to your entire Google Photos library. Learn more about using the photo picker.
Share photos & videos with Google Photos picker in Gmail
Important: You can instantly share photos and videos through the picker which automatically uses your signed-in Gmail account to access your Google Photos library. No separate sign-in or authentication steps are required.
You can email backed up photos or videos directly through the Gmail app.
- On your iPhone or iPad, open the Gmail app
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- At the top of the email template, tap Attachment
Google Photos
.
- Choose the photos and videos you want to share.
- At the top, tap Done.
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Google Photos 
.Tips:
- To find your photos in your albums, you can use the search bar at the top. The search results can display recent queries and may also match keywords to album names.
- You can add multiple photos and videos in a single picker session.