Whoa, all this talk about thumb drives and cables and cloud transfer. There's a simple, safe, fast, easy way: use a solid state drive, maybe 2 or 3 terabytes depending on the size of your files - 2 is a lot. Plug it into the USB port, open the folder containing the docs you want to transfer; then open the SSD drive. Copy and paste. SSD drives are fast. Then just leave the docs on the SSD for backup; you'll have plenty of room. You could also save several thousand photos on that drive; great for backup of all things.
Once you've used a SSD you'll not go back to antediluvian flash drives or old fashioned externals that are prone to failure.
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