Hi,
that's weird.
I uploaded maybe less images by ones for I didn't notice this issue before.
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Can you try to upload, for example only, 15 images, each one must have different / unique filename. Please use test images not this same as you used before. And let me know.
Ok, thanks for info.
Now with this review we can do something with it in next version,
and right now all I can suggest is ... upload max 20 images per one process.