not sure if it applies as a NIP-94 client, but I'm working on a Blossom/NIP-96 server/blob manager which allows users to edit file metadata. Here's a screenshot of me editing a music upload which should be in production tomorrow:

https://primal.net/e/nevent1qqs2xhr3sh6g4qh8h6c7wegav4kvfhm7un0ma34ksedfvxydhw0zzacea3ke8