I am scheduling posts that include an image from my phone. Some are scheduled for a week or more away. Do I have to keep the image on my phone until after it goes live, or are the images immediately uploaded to the server when I schedule it? Basically, if I delete the image from my phone before the scheduled time, will the image be there or will it be the error box?

When you add the image to the post, it is uploaded to the server and has a url at that point. So, you should be safe to remove images from your phone.
That’s what I wanted to know. Thanks!