If there is any special character in the name of folder or file then its not getting attached using the “Add From Server” plugin. It get attached normally using normal media upload of WordPress.
I have uploaded all my pictures in the many folders. Now when I try to attached pictures from specific folder to particular post, it works fine if there is no special character in the file like angelina jolie. However when i try to select folders whose name have special character like Luz-Elena-González (speical character in “a”), Adrianna-Léon (special character in “e”), such folders not getting selected via this plugin. Same is the case if i select file whose name has special characters. It may be the problem of coding UTF-8. But i have checked from my server end. It has UTF-8 as unicode. I am not able to figure out the problem. Anybody knowing the solution please help me.