Hi Endiyl96,
Regarding the 99% - what size is your .rar file? In case you the internet connection is not working at high speeds, it can get tough to upload huge files at the moment. We'll be increasing the maximum file size in the future though.
As gstudios mentioned, you can choose the option to specify the additional formats, but after the uploading processing is complete, most of the file formats should be recognized.
Though having different folders for your 3D files can be more convenient for the buyer, of course, if he doesn't need all formats at once. But at this points it's definitely up to you to decide that. :)
Regards,
Eddie, CGTrader