I too was critical of Flare.pub when first launched. It's incredibly centralized, relying on AWS to host files. The only "Nostr" thing about it, at least when I first looked at it, was that it solely relied on logging with with Nostr to create a channel.

IPFS might be a good option for you to try. 

 Thanks for the hint with IFPS 🙏Very interesting! I didn't find anything suitable on first glance, but I'll follow this.