I created a post on the iOS app, but then published it from my drafts in the macOS app. The picture that I included on the post shows up on my micro.blog but the picture did not get cross posted. The text did crosspost!
EDIT: additional details - the photo does not appear on the photos page of my website, and does not show up on my timeline (meaning the feed I follow in my micro.blog account), however it does appear on the post if I go directly to my website homepage.
EDIT 2: It also looks like it crossposted to all my sources, even though I unchecked my linked-in source.
Certainly possible all this is user error, but reporting here just in case!