Walmart couponing

I used to do the Walmart couponing through ibiotta and that has recently changed, now Walmart does the Cashback itself. I'm struggling to get cheaper or free products. For example, I can get Colgate toothpaste for free using an Ibiotta and Shopium coupon. When I go to Walmart, it automatically does the Walmart Cashback ( replacing ibiotta), but when I go to submit the receipt in Shopium it tells me I'm unable to use it since I already have a Cashback offer. Any one know any tips to overcome this? Plus, I'm not a fan of getting Walmart Cashback for future purchases, I prefer the money in my wallet to use at any place. Thank you.