Ubuntu – Is it possible to lose files simply from moving them folder to folder

I recently moved a file from one folder to another, and in the process, lost the files. All I did was drag the files from one folder to another, yet it somehow got lost on the way. I have tried every searching function I could – find command, locate command, kfind, etc. The files seem to be gone, and I have no idea why. Can someone please help me?

To be more specific, here is what I tried:

1. "Search your computer" app on the sidebar. This yielded nothing, and as a note for anyone with a similar issue in future, this couldn't even find specific files that aren't lost.
2. locate -i "filename*" in the terminal. This yielded no results, or any response form the system at all (I was expecting it to tell me something to the effect that nothing was found, but it would just give me a fresh shell prompt). I also tried the exact file name, but with similar results.
3. I then tried the find command- find / -type f -name "filename*", and got a lot of search results that were stymied by being denied permission. I then added a sudo in front of the identical command, and it was able to search more directories, but funny enough, it still was denied permission to a certain directory, though one I'm confident wouldn't hold the files in question.
4. I installed kfind, and it yielded nothing.
5. I used the magnifying glass in the home directory, and it didn't find the files either.

Re: the other thread, I decided that the question asked there put too much of an emphasis on the search function, which doesn't seem to be the problem, so I created this question that put more of an emphasis on the filesystem and the crazy fact that all I did was attempt to drag the folder containing my files, so that I could at least ascertain if such an issue is possible.

Re: the destination folder, it was indeed a shared folder, though I hate to admit that in retrospect I'm not sure if it had been mounted when I attempted to move the files to it. In that case, however, wouldn't it just act like a normal folder, i.e. it wouldn't simply lose files?