Pictures can't be blank.

Hello, i’d like some help, i received a fantastic picture that i’d like to post but it tells me this.
 
•Image should not be larger than 25600kB  
•Image can’t be blank
 
It shows fine on my PC, and on the preview.
 
Edit : Kb makes no sense to me, it somehow works now. Sorry.

That likely meant the image was over 25mb and the system choked on getting it, or there was an error in the connection and the system got a corrupted file of which it couldn’t tell the total size or read properly.