Police have released the first image of a four-year-old who went missing on his family's property in outback South Australia six days ago.

Gus was last seen playing on his family's remote homestead, about 40km south of Yunta, at about 5pm on Saturday.

The four-year-old is described as Caucasian, with long, blond, curly hair.

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His family had previously declined to share an image of Gus with the media.

The military is set to join as the desperate search enters its sixth day.

He was last seen wearing a grey sun hat, a cobalt blue t-shirt featuring a yellow Minion animated character, light grey long pants, and boots.

A small footprint was found yesterday about 500m from the homestead.

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Police said today a contingent of 48 personnel from the Australian Defence Force would deploy to the search area at 8am ACST today, and are expected to help with ground searches over the coming days.

Other specialised resources involved in the search include mounted and water police, dog police, PolAir, police cadets, SES volunteers, drones, an Indigenous tracker, and community and family members.

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In a statement issued earlier this week, Gus's family asked for privacy and said they were "devastated" by his disappearance.

"Gus's absence is felt in all of us, and we miss him more than words can express," they said.

"Our hearts are aching, and we are holding onto hope that he will be found and returned to us safely."

Anybody with information is urged to contact Crime Stoppers at 1800 333 000 or online, quoting reference #25013.

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The bank’s five-year special rate is also cut, now sitting at 4.99%.

A police dog unit vehicle crashed during the operation but no one was hurt.

The teenager is reportedly among three Kiwis aboard the Global Sumud Flotilla.

A court heard the victim had been affected psychologically, physically and spiritually.

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Snapchat has begun charging users up to $15.99 a month to keep their memories saved on their accounts, admitting it is never easy to start paying for a service that was previously free.

Users have been able to save their photos as memories on their accounts for free since 2016.

But now, the social media platform has rolled out storage plans for those who have memories exceeding more than 5GB of storage.

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It will cost $2.99 a month to upgrade to 100GB of storage, $5.99 a month to upgrade to Snapchat+ for 250GB of storage and $15.99 a month to upgrade to Snapchat Platinum for 5TB of storage.

At its peak, users could be paying up to $191.88 a year. 

"For the vast majority of Snapchatters, who have less than 5GB of Memories, nothing will change," Snapchat said in a statement.

"For Snapchatters with more than 5GB of Memories, meaning thousands of Snaps, we are rolling out new options to upgrade and increase storage."

Snapchat will provide 12 months of temporary storage for those who exceed 5GB, as they decide whether to upgrade or download their memories to their device and delete them from the app. 

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Snapchat said it never expected memories to grow to what it has today, with more than 1 trillion photos saved on accounts around the world. 

"It's never easy to transition from receiving a service for free to paying for it, but we hope the value we provide with Memories is worth the cost," it said.

"These changes will allow us to continue to invest in making Memories better for our entire community."

Australians are being charged more and more for online and digital services, with Apple TV+, Spotify and Netflix raising their subscription prices in recent months. 

Nine, the publisher of this website, owns streaming service Stan.

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Police say more than 70 people have joined the search over the past week.

The number of confirmed cases has now risen to nine. The latest three were close contacts.

A fire investigator has examined the scene, as police investigate a wilful damage report.