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The Sequence Builder offers the ability to manage Collections of collectible metadata, including: collectible details, images, and properties. Within the Builder, Collections can be linked to deployable contracts from the Builder for easy crafting flows. Media and metadata is saved to Sequence servers where certain functionality allows you to have control over updates and public or private viewing of your collection information.
APIs are also available to manage your NFT collection metadata.

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1. Create a Collection

First navigate to your project from the top left hand drop down of Sequence Builder and select the Collections page view from the left nav, then select the + Create a collection
create collection
Then input your details for the collection, like Collection Name, Description for the contract info, Collection Data being Visible (Public) or Private (Hidden) where for the data to be viewable select Visible (Public), and include your projects External Link to a website.
add details to collection
After a collection has been created you can first link a contract by deploying a collectible contract (i.e. ERC1155 or ERC721) and having the baseMetadataURI being set on the deployment by selecting the Link contract Then select the Deploy new contract
link a contract
Select your contract type or upload your own
contract type
Next, you will be able to see the details of the contract type
contract type chosen
And complete your contract details, specifying the Network, Contract Name, and Royalties, whether to publish the Collectible on the Token Directory and finally select Deploy Contract to then complete the transaction signing in the Sequence popup.
contract details
If you deploy from Builder on production networks, treat the deployment as self-funded. Gas Sponsorship can still be useful for relayed interactions after the contract is deployed, but the deployment transaction itself may still require the deploying wallet to pay gas.
Then you will notice if you check out the Read Contract section tab of the contract, if you Read from the baseURI it will show you the metadata url from Sequence where when read from the Indexer, <token_id>.json will get appended to the end to reference the json for the collectible.
read base uri

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3. Create a Collectible

In order to create a Collectible as part of the Collection, return to the Collections page and select the + Add a collectible
add a collectible
Then update the details like Collectible Name and Description, then upload your artwork by selecting the greyish field
update collectible details

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Add a metadata property

You can also add certain properties to your collectible, by selecting the + Add a property which can be useful for inscribing more information like numbers or strings when using the metadata in any game.
add a property
Assigning the key and value to each property
asign properties
Complete the prior steps until you get your final result of a collectible added to a collection
final result of collectible added

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4. Update Info in Settings

At any point you can update the details for your collectible in the settings
settings
Once in settings, you can update any one of the information fields, like: Collection Name, Description, visibility of Collection data, and an External Link to reference a website on the web.
settings

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Delete Collection Data

You can delete all of the Collection data for the contract by selecting Delete collection data which will permanently delete data all data, an action that cannot be undone.

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5. Reference Metadata Token URI

Currently in order to Link Contract you can’t use predeployed contracts, but you can read the Token Metadata URI from the Collection to set your existing contracts’ setBaseMetadataURI. The URI can be retrieved by accessing Metadata URIs button
copy metadata uris
Then copy the Token Metadata URI from the modal and use the URI to write to a contract with the setBaseMetadataURI function, or, use to reference metadata directly in an application by appending a <token_id>.json to the URI to access the metadata
access metadata uris