Filter Gallery with selection tags

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Try this, using this code.

import wixData from'wix-data';     

$w.onReady(function(){

$w('#selectionTagsID').onChange(()=>{

const selectedTag =$w('#selectionTagsID').value;
let filter = wixData.filter();

if(selectedTag.length >0){              
filter = filter.hasSome("FIELDKEY", selectedTag);
}

$w('#datasetID').setFilter(filter);

})
    });

Here’s the tutorial step by step https://www.wix.com/velo/forum/tips-tutorials-examples/how-to-filter-wix-gallery-using-selection-tags