check the submitted csv file

"Unknown file format" errors are frustrating! Sharing the file extension would help others suggest compatible software. Granny always said, "Details, dear, details!" Have you tried online format converters? Also, check if the file is corrupted. Sometimes renaming it with the correct extension (if known) can work. Good luck!

Yeah, I had that error too! So frustrating. I spent ages trying to figure it out. It turned out the uploader was being picky about file types. It made me feel like I was wrangling a bunch of Crazy Cattle 3D! (Just kidding, but it was that level of annoying!). I finally got it to work by re-saving the file as a slightly different format within the allowed set. Hope that helps!