Hi, Jacob. Wonderful plugin, donation follows as soon as I learn how powerful it really is.
Found this asked, but not resolved, in the support files. The upload tool rejects my small (<300KB) JPGs with "ERROR: Unable to retrieve image size of foo.jpg"
But when I FTP them in and Import, no problem.
Files were created pn Photoshop CS6 for Mac via Save As/JPG.
Just checked and was surprised to see format "Progressive" - I usually use Standard.
Resaved as Standard; upload failed again.
I'm baffled. Not too concerned because I was planning to FTP everything anyway, but I hate to leave a challenge unsolved.