This varies on a case by case basis. Some OTAs will allow you to manually upload additional images through their extranet. Among those OTAs are Agoda, Booking.com, CTrip, Expedia, Hotels.com, Hotel.de, HRS, KAYAK, MakeMyTrip, Orbitz, Travelocity and TripAdvisor.

Please let us know if you would like to manually add additional images to a specific channel and we can individually explore if this is possible. 

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