I have been teaching English for about 14 years now, and I have made... and made... and made... so many (thousands of) activities that storage and retrieval is now my main issue.
Having split my materials into the following three main folders (hundreds and hundreds of sub folders) I now spend far too much time wondering what I have, despite the fact that I made 99% of my materials from scratch.
So, how best should I organize (re-organize) my digital materials?
I am sure that this is a stupid question and that someone, perhaps many folks, has already suggested great solutions.

Example.
Let’s say I want to find, catalogue and organize my “numbers” activities. I have to search though the three main folders and their subfolders: Junior high sets / Elementary sets / images and flashcards.

If you, too, have encountered and solved this issue, please offer a brief suggestion, including software options, not just “re-make all your folders according to theme and then level folders inside those.” Perhaps that’s the only option?

Yes, I can just do a file-browser search on the entire USB, but that is often less effective than I would like (because I may not have named every single file with the most ideal name, etc).

What can I say that has not already been said? Organization is very personal and it all depends on what you teach and to which levels.

I taught English and French for over 35 years so you can imagine how much material I had. I used the same system for each language making folders, sub-folders, etc and it worked. I’m a very well organized person and could not have worked otherwise.

This is my TEFL collection. Inside each folder there are sub-folders and inside those other sub-folders etc, etc which makes finding things so much easier. I taught business English, vocational English (specific groups mostly in companies) general English, children and adults so needed to file them separately.

But as I said above organization is a very personal thing! Hope you get some interesting hints here!

Janet