--src /Users/username/images/testfolder directory have too many files? Maybe you can try to set a number of fibers，example: upload 5 files at the same time instead of all the files, like this.
--src /Users/username/images/testfolder directory have too many files? Maybe you can try to set a number of fibers，example: upload 5 files at the same time instead of all the files, like this.