I can replicate the issue (Chrome, on MacBook).
Historically, it looks like this has already happened in the past, e.g.:
- https://forum.inaturalist.org/t/failed-to-save-record-when-agreeing-to-annotations/8200
- https://forum.inaturalist.org/t/failed-to-save-record-again/10108
- https://forum.inaturalist.org/t/impossible-to-save-id/10828/7
- https://forum.inaturalist.org/t/checking-no-its-good-as-it-can-be-fails-to-save-record/32001/4
My guess is on a transient error in the cloud infra, but just in case @tiwane might be good to give a heads-up to the technical team.