How do I let clients download high-resolution photos?
Enable full-resolution downloads on the gallery. Clients can then download single images or the whole set as a ZIP at original size. Most gallery software also offers a web-resolution option, which is the safer default for social sharing because it keeps print-quality files behind a deliberate decision rather than a stray click.
Why two resolutions exist
A 45-megapixel RAW conversion is a 30 MB JPEG. A parent forwarding photos to family does not want that, and neither does their inbox. Web-resolution files are 1-2 MB, look identical on a screen, and are useless for a print sale you would rather make yourself.
Deliver web-resolution by default, and turn full-resolution on for the client who has paid for it.
In SnapFlow
Download permission is a per-album setting, and the download quality is configurable alongside it. Guests can take a single frame or the whole gallery as a ZIP.