Was this because of the file extension? I’ve just enabled support for uploading .syslog files.
Noting that BR is on break at the moment, and will return on the 5th of January.
Assuming you’re referring to the chunks from the Raw tab, they’re backups that the main video recording files are generated from.
If your normal recordings are fine then those chunks can (and should, from time to time) be deleted to free up some storage on your computer, but if you have recordings that aren’t processing properly into playable video files then they could be worth keeping around if you want those recordings recovered / the problem to be investigated.