Metadata extension JSON schema

[erectilereptiles]

Hi. I would like to know how I can find the JSON schema for the metadata extension? I am using your token for a university project, as I did last year. This year we need to add images, videos, audio etc. to the tokens. From my research I see that I need to use the token URI. I have downloaded ipfs desktop. On this I upload an image and receive a link for the image. I think need to put this link in a json file and receive a second link from ipfs for the json file. This second link is then inputted as the tokenURI when minting a token from remix. Is this correct so far? After doing this I could still not see the image of the token on etherscan, openSea etc. One of the errors I got was on CheckMyNFT saying:

"Error: Could not fetch token URI. This token likely uses a non-standard metadata set-up. Review the “Read Contract” fields in Etherscan to see which fields relate to the token metadata (i.e. look for fields such as tokenIPFShash, getArweaveImgHash, or other similar fields)."

The json file I created I saw on an old tutorial using your token. It consisted of the following:

{
"name": "NFT image", "description": "image of nft", "image": "https://ipfs.io/ipfs/QmPBjTrNNpT9thR3jysN2m4fETcR9hzUr2fpSkefUWiepb?filename=nft.json",
}

Is this schema correct? If not what is the correct schema? Alternatively where can i find the correct schema? I have been looking but to no avail.

Thanks in advanced for all of your help, really appreciate it!
Kindest regards