I have a multisite with three blogs.
Previous to upgrade the uploads are like this:
mainsite.com --> wp-content/uploads/2014/8 sub1.mainsite.com --> wp-content/uploads/sites/2/uploads/2014/8 sub2.mainsite.com --> wp-content/uploads/sites/3/uploads/2014/8
After the upgrate to WP 3.9.2 and apply "Ppgrade network" the uploads are like this:
mainsite.com --> wp-content/uploads/2014/8 sub1.mainsite.com --> wp-content/blogs.dir/2/files/2014/8 sub2.mainsite.com --> wp-content/blogs.dir/3/files/2014/8
The src of images are like
sub1.mainsite.com/files/2014/8/image.jpg loosing all older images previous to the upgrade.
How can I solve it?