Publish photos on this page
Stay here. Choose a file under Upload new, add a caption (used as alt text), then Save property. Guest gallery photos attach from this form. You do not need the Payload CMS Email/Password login for this step.
Payload CMS Media uses a separate Email/Password login. It is not SSO with this operator page. Ask Georgi for a Payload user if you do not have one. After that login, upload in Media, return here, attach the image, and save.
Open Payload Media (separate login)