How to push values to property array Cypher-Neo4j

Question

I am new to Neo4j,I have two nodes user and files with a relationship :contains, the relationship has a property idwhich

Answer 1

full query for newbies

MATCH (a:Application {name:'A'})-[r:REQUEST_TO]-(d:Application {name:'B'})
WHERE ID(r) = 684
SET r.id = r.id + 'New Id'