Unable to create post with uploaded image

I've been attempting to create a post in !motorcycles that has an uploaded image as the URL. The image uploads fine, and I double checked the URL to ensure it's valid, then I enter the post info, select a language, and hit create.

I see the create request get sent over the websocket but it just hangs permanently and never gets a response, nor is the post ever created, so not sure if something is hung up or throwing an error on the server side there.

Edit: and obviously I can create posts in general, since this was successful...