@Echo Bounce
If you put a
site url, like a twitter post, in “link a deviant art, tumblr, etc” field, the site will attempt to get the first image, because that’s what twitter will send over. As that argument is given after the file upload field, it will override what ever’s there.
When dealing with twitter or tumblr posts with multiple images, you should wither download the image and upload it from your machine, or put the link to the image file (ie. .png, .jpg, .gif, .webm) in the field mentioned above, and then add the source link in the last field.