The assessment thats prone to help most people reading this is, that this is an ID-10T error or a PEBKAC issue. (See
https://www.lifewire.com/have-you-been-the-butt-of-a-tech-joke-2619218 for reference.)
Its much less helpful, if "I guess for some people it works, and for some it doesnt" sticks as the outcome here. As no one was able to help the other person out - lets be more concerned about the overall message this thread portraits, than the individual outcomes. But only because of that, because individual issues are very important otherwise.
Also of course he wrote /root/ to indicate /
Potential other issues (some even not related to usererror at all) - could range from "not being able to copy a folder" ("I pressed the home button, what now?") to "not knowing what a folder is", to the USB "thingy" used failing intermittently to fake high capacity SDcards bought from ebay or third party Amazon sellers... Every one though is at least in part unlikely - which is part of the problem here.
Find someone for whom it works. Compare methods. You can promote yourself as doing all the right stuff on the internet, and we have no way of knowing, if you really do.
There still is a rule of probability at work though that states, if you are the only one with a process related tech issue - out of 100 or even 1000 people, chances are - that its you and not the process.
Todays chips made out of silicon, are much, much, much more prone to instabilities, or failures that might cause a process not to work one time out of thousands (cause an instability, cause a crash), than to a failure state, that results in "one person not being able to reproduce the results every one else is getting". So if you've tried this twice - and no one else is having the issues you are having.. Probability wise - it doesn't look good for you...
The same goes for universal standards such as USB. Filesystems...
An "accidental" read or write (as in "no one could have predicted it not happening") - is usually not something that hackers, or programmers deal with.
Which in part is also why geeks gravitate toward technology. Reproducible results. We like those.
When tech companies have to interact with the rest of the general public though, they usually hire telefon support people who are very efficient in telling you, that you are absolutely correct - and now, go on and buy something else - because your issue is so complicated - it couldnt be reproduced by anyone but you... Then you feel good, and buy the next product. Then you give a helpful Amazon review ("I likes this product, because it works - I've bought other products in the past - and they didn't works. I really like the one that works. Everyone buy those! 4/5 stars, because I didn't like blue.").
But good news, Alexa and Siri (/machine learning) might solve your issue in the future:
https://www.wired.com/story/machine-learnings-amazing-ability-to-predict-chaos/
Very impressive..
edit: Also - if you think about it, this is also why "public beta tests" can be a thing. If there would be "Bob", or "Timmy" issues it would not be possible to fix those before release..
So it always comes back to "if you are the only person that can produce it", thats a bad outcome. For everyone involved.