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The photo is seen at https://stock.adobe.com/images/dog-canine./510437762?as_campaign=TinEye&as_content=tineye_match&clic...
I am the original author and I provided the photo for free usage, but it doesn't mean that it can be sold - https://unsplash.com/photos/KGy1GFeKBu4 The Unsplash license forbids it: https://unsplash.com/license
No, it is not allowed to use other people's assets. For being a contributor, you need to have ownership over the asset you share.
You can file a copyright claim as the owner. See the link below: