I've seen this a couple of times. Check and make sure that you have a file name in the bottom right corner of the screen where your STL file is, next to the pencil. I've highlighted it in green.
If the file name is missing from there, the printer will not be able to receive the print correctly and will think the print is immediately done.
I have tha same problem. Ultimaker 3 Ex is printing by networ, but with USB reports print finished immediately. I tryied with Cura 2.4 2.5 2.6. Help!
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