Things become much more complicated then first impression when you try to really explain something. For example I went to a football game with a group of Chinese grad students and they asked me how a team can score points. I thought to myself this is easy, and began to explain the rules.
1. Touchdowns are worth 7 points... err they are worth 6 points technically
2. After a touchdown the scoring team can decide to kick the ball through the uprights for 1 point
3. The scoring team can decide to run another regular play and if they enter the end-zone again on that 1 play they get 2 points.
4. Fields goals are 3 points and are scored when the team on offense can kick the ball through the uprights.
5. The defense can score points if they can tackle an offensive player in the end-zone while they are holding the football. The defensive team then gets 2 points and gets the ball kicked to them on the following play instead of the normal system where the scoring team kicks the ball to the other team.
6. If the defense can steal the ball and run into the end-zone they are facing then it is a touchdown and rule 2 and 3 apply.
By the end of this discussion they were more confused then when we started. So when you say how hard can it be to explain how to store a file questions like.
1. How to delete?
2. How to rename?
3. How to create folders or other organizational structures?
4. How to move items between organizational structures?
5. How to copy an item already in storage?
6. How to download multiple files?
7. Can security be set or changed?
8. Oh yeah and how to I upload a file in the first place?
The more precision you apply to a discussion the more complicated they tend to get. Just like a touchdown is 7 points is easier to understand, upload a file is easy too.