When submitting a release from picard with 6666 tracks on 1 medium, It got stuck at the "Add medium" edit. The "Add release" and "Add release label" were the only edits that worked because they came before the medium edit.

It loads for some time, then I get an "error: 504"

https://archive.org/details/letov_0126 https://musicbrainz.org/release/3d9df174-1a38-4ecc-b11b-896e9fda1ee2