I recently added a NFT token in the MetaMask mobile app which I purchased from a NFT marketplace. It is a ERC1155 smart-contract on arbitrum one network. The tokenId is visible but unable to see the NFT image. I am able to fetch the metadata from the URI.
Any possible explanation for this?
hey @niraj ,Welcome to MetaMask community. 
There is a similar discussion here, and the post mentions a solution. You can see if it works for you.
Hi @niraj !
MetaMask does not support viewing images that are ERC-1155. You can use MetaMask to store these assets.
This article for more information:
If your NFT is on Arbitrum, you could verify it’s there using arbiscan.io (although you can’t see the image).