He stared at it. The negative sign was gone.
Cloud storage and FTP clients often calculate the difference between local and server files. A negative number might represent data that was deleted or "over-synced" during a session.
This is due to allocation unit size on your hard drive. A file that is logically 6.73 MB may take up 7.01 MB of physical space because the file system (NTFS, APFS) uses fixed-size blocks. Check the “Size” vs. “Size on disk” properties. As long as the “Size” reads 6.73 MB (or 6,730,000 bytes), the file is intact.
Older versions of FileZilla or WinSCP occasionally struggle with modern server compression.
It looks like you’re trying to download a report that is approximately in size, but the specific link or file isn't attached to your message.