Dragging & Dropping A File With Long Name Results In File Transferred Using Short Name

WinSCP 6.5.7
Windows 11
Transfer protocol (SFTP, FTP, SCP, WebDAV or S3): SFTP
GUI Commander style

Drag a file with a long name to a remote server (example: C:\Users\yourn\OneDrive\Documents\Light Novel\Isekai no Binbou Nouka ni Tensei shita node, Renga wo Tsukutte Shiro wo Tateru Koto ni Shimashita\Reincarnated as a Poor Farmer in Another World - I'll Use My Modern Knowledge to Build My Own Kingdom - Volume 2.epub)
Video attached

Thanks for your report.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

I've replied to your email with the trace file.