From the U1’s home screen, click ‘Start’ to get a list of print files available, with previews from the images embedded in the G-Code.
However, the actual image seems to be from a cache. If the filename happens to match an existing previous file, even if that file got deleted rather than over-written, the cached image is displayed not the image from the actual file.
It’s a speed-up to have a cache, but the cache entry needs to be voided under some file management situations (when a file is deleted, or over-written).
Is there a means to force the cache to update – ie re-scan a file? I couldn’t find one.