Upload and Download Issue

All done and successfull set Directory as Home after creating User and can successfull login. Nice job, well done by the way!!!

But when I upload data (Like .PDF / .PNG / .ZIP ) files successfull and want to download them. 
- Only message "Something went wrong in red".

Also take care that the files are not available to open and the size is even much smaller then the original one.
any idea?