Hi panfren,
Thanks for writing to us on this.
WPSiteSync itself does not make any changes to file names. We do update directory names if the Target site is installed in a subdirectory, but that’s just to keep the path naming consistent with other images in the Media Library.
You mention that the names are “messed up”. Can you give an example, before and after of the name changes?
What could be happening is you have a plugin on the Target site that is modifying the image name. Something like the Clean Image Filenames plugin will do this. What plugins do you have running on the Target site?
We would be happy to work with you on resolving the issue. To start, we would need to get some log files from you. You can find instructions here on how to set that up: https://wpsitesync.com/knowledgebase/enabling-debugginglogging-wpsitesync/
Once you have the log files, please submit those to our Support page at https://ServerPress.com/contact/ so we can review them.
All the best,
The ServerPress Team