To use the galleries feature it has to be enabled in your collection.
Galleries are not enabled by default, to learn how to enable them, visit the Manage Galleries section.
NFT Galleries
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When minting an item you can assign the new item to a Gallery, if the item was already minted, you can always edit the item and assign it to one or multiple galleries.
The first step is to create your own Gallery or Galleries, for that do the following: