As soon as I read the article on WordPress about being able to share to Tumblr, I set it up and wrote a post. Everything went OK because the text preceded the photo and it was the text that showed up in the extract on Tumblr.
Everything did not go well with the second post because the image came first and, as with most of my images, I had captioned it.
The coding that sends the extract winging off to Tumblr did not like the captioning code and it messed it up.
I reported it to Support at WordPress and they acknowledged the problem and emailed me to confirm when they cured the issue.
So this is a short post to test this out.
This is the link to the Tumblr site and you can see whether the ‘share’ worked OK.
It copied OK but the shape is all squished.