You are sending the file length of the base64 encoded string $file_data'content' Instead, send the length of the decoded $content .
You have stored some data into the database. On retrieval, you didn't get the original data back. That's why.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.