Good answer. Lots to think about. I was certainly not thinking about something private, although privacy can easily be achieved if the client just encrypts the file before uploading it and decrypts it on download, no? The blobs could then spread and they would still be encrypted... Some form of tagging would definitely be useful - which could also be used to build a tree-like structure on the client (to emulate folders). Could the server just return a json containing tags on `HEAD` or `GET "hash/tags"` or something?

Great! Thanks for at least confirming that what I was looking for does not actually exist. I was absolutely sure it must exist, because it seems like the killer app for Blossom, really! And one of the must have apps built on Blossom... Hope somebody builds this. It could of course be just a separate feature in a regular Nostr client, but it feels like a simple separate app would make more sense.

Is there such a thing as an Android Blossom client? If not, why not? Wouldn't that essentially be my own cloud (assuming I run my Blossom server)? I know many Nostr clients upload to Blossom, but what I am looking for is different: not a client that I use to post notes, but one that I use to manage my files...