Here is a good pictorial guide for you to follow.

Create Bootable USB Flash Drive to Install Windows 10

How to Create Bootable USB Flash Drive to Install Windows 10 from

www.tenforums.com

 

OK, IF the usb is formatted as fat32, you cannot copy the iso file. I assume you are doing this with the idea of installing windows. If that is the case, copying the iso file is not going to accomplish anything.
If it is your intent to install windows, then you need to create the bootable usb. This is best done using the media creation tool. You need to tell it to create install media for another computer NOT to download the iso.

Another option is to use something like rufus to make the bootable usb from the iso however IF you use rufus, you need to know what type of partition scheme you are using ie gpt or mbr.

 

OK, IF the usb is formatted as fat32, you cannot copy the iso file...

To clarify what CRJ stated - if your drive is formatted as FAT32, then the maximum size for a file to reside on the drive is 4GB per file. Your ISO is more than that, hence the message.


Judging by what you said, you are probably at this point in the directions from MS site you linked:

1. Select which media you want to use:
   • USB flash drive. Attach a blank USB flash drive with at least 8GB of space. Any content on the flash drive will be deleted.
   • ISO file. Save an ISO file to your PC, which you can use to create a DVD. After the file is downloaded, you can go to location where the file is saved, or select Open DVD burner, and follow the instructions to burn the file to a DVD. For more info about using an ISO file, see Additional methods for using the ISO file to install Windows 10 section below.

Personally the first option would be the better way, but if you are looking to manually do the installation thumb drive, then you will need follow the (somewhat vague) instructions.

 

To add to the above, if you use the Media Creation Tool to make the USB install drive all the present contents on it will be removed, so back up any files you want to keep first..

 

Thanks for the feedback everyone. Yes, it was formatted as fat32. I converted it to NTFS and it worked. Thanks

 

What is it you are trying to accomplish? If you just want to copy the iso file to a usb, then yes you are done. You are not going to be able to install windows from the usb.
Post exactly what you are trying to do.

 

I am trying to create a bootable USB but at this step I'm just using the USB to transfer over the iso file to my Chromebook. Then one the Chromebook, I'm using the Chromebook Recovery Utility make the USB stick into a bootable drive using the iso file (now transferred onto the hard drive of the Chromebook and renamed to Windows.bin). I'm following this guide: How to Create a Bootable USB on Chrome OS (Chromebook) - Technastic

Thanks for the tips but I've accomplished my goal. I created a bootable USB drive (though I haven't tested it yet).

 

Next time if you need to copy a file larger than 4GB to a flash drive you need to have the flash drive formatted with exFAT instead of FAT32.