I tried to make local Campfire event for the Gmax Pikachu but got stuck in the event creation page (with errors) until I removed meetup photo.

Campfire Meetup refused to accept any meetup photo (with error text: Sorry, something went wrong. please try again).

Tried different pics, different photo sizes and so on. Also restarted phone, cleared Campfire cache and reinstalled the app. Can't add meetup photo, can't edit and add either.