A Photo is a publishing identity. The files you upload are candidates for it. Add several candidates (different angles, a re-shoot) and choose which one is live without changing the URL.
Drop files on the Photos page or on a Photo’s workbench. This release processes JPEG, PNG, WebP, and TIFF, one HEIC, and a Canon EOS 7D sRAW2. Files over 32 MB are refused before upload starts.
Uploading does not run the pipeline and does not publish anything.