I could not seems getting file uploads working properly on r.hostr.cc yet.
Probably need to use relay that support nip 95?
Hostr v0.1.5 Released!
⚙️ New Features
・Compatible with NIP-95 and supports files such as txt, pdf, svg, etc.
・The console display when uploading images is easier to read.
・Change secure mode domain from h.hostr.cc to hostr.cc.
https://github.com/studiokaiji/nostr-webhost/releases/tag/v0.1.5
Discussion
r.hostr.cc will support NIP-95 later today!