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In Properties, @(type: txt, sha1: <sha1 value>, md5: <md5 value>, name: Artifact7.txt) should be @(%(type: txt, sha1: <sha1 value>, md5: <md5 value>, name: Artifact7.txt)).
If you're more used to JSON, those are equivalent to ["type: txt","sha1: <sha1 value>","md5: <md5 value>","name: Artifact7.txt"] and [{"type":"txt","sha1":"<sha1 value>","md5":"<md5 value>","name":"Artifact7.txt"}], respectively.