it means 4 attempts were made to upload it and 4 were successful. However it may be 4 prts of the file which all went to one host who possibly got other parts of it from other hosts. Or it means 4 people have successfully uploaded the file (or ssomething in betweeen)

If you look in the monitor window and the uploads have not been cleared you will see more clearly what happened.

You can chose whether to cauto clear uploads in Options or preferences > uploads basic > Clear uploads.

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