1 - Initialize the installation process
Go to GSuite Marketplace to install the Photo Gallery add-on. Click the Install button once there.
2 - Proceed with the installation
Click Continue to proceed with the setup.
3 - Choose the pertinent account
Choose a Gmail/GSuite account to be used for this add-on.
4 - Allow all permissions
The permissions need to be allowed for the add-on to run optimally. Click Allow.
5 Installation successful
The Photo Gallery add-on is now successfully installed for Google Sheets. Click Done to close the setup window.