There is no such thing as a 'camp contract'.
No player signs for $2,000 ... $4,000 ... $6,000 a-week for Training Camp. Just not how it works.
Take a quick look at the Rams' page for cap sites Spotrac or OTC. Every player has a contract, with ... at least ... a minimum (for first-year players) of $840,000. Just like with Wynn, those contracts are predicated on the player making the 53-man roster.
Some players have guarantees. Some undrafted free agents have already been paid small bonus amounts. Many players (like Dresser Wynn and Xavier Smith) have little or no guaranteed-$. They need to make the final roster for their contracts to kick-in. The players that wind-up on the Practice Squad get compensated but for amounts far less than the League minimum (between $840,000 and $960,000).
Of course, the players have to receive some compensation for their training camp efforts. Earlier today, another poster was good enough to provide the weekly amounts.