If I add an image block to a page, there's a field for a link URL. For whatever reason the block doesn't let you select an internal link. I don't want to use an absolute path. What is the proper syntax to put here to go to a local page?

I've tried just the alias, but that doesn't work right. It works fine the first time you try it after exiting edit mode, but the next time you go to that page that alias is now added to the existing URL thinking it's one level down.