It's not currently possible to select media from Google Photos directly within the 1SE app.

If you want to add media from the cloud via Google Photos, you'll need to download it locally first by going to Google Photos and select "Download to the Device." You can learn more about this here.

Once downloaded, this media should now appear when you select a snippet in 1SE.

You can still use Google Photos as a backup tool for your media files. 

Here's a write up on using Google Photos.

Here's a Google help write up for Google Photos.

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