Adobe Audition .sesx file error

Hi! I'm new to using Adobe apps, including Adobe Audition. I keep running into a problem when trying to open saved Multisession files (.sesx). I keep getting an error message "the byte stream type of the given URL is unsupported" when I try to open these files. Thankfully I am just practicing and haven't lost any significant work, but I have to get around this problem before I try to do anything else in Audition. It's does it with every .sesx file I save and try to open. I have zero problem opening waveform files and other single track files, whether recorded in Audition or somewhere else. For the .sesx files, I'm using the newest version of Audition and recorded the individual tracks inside that version. I have also tried using files created elsewhere just to see if it makes a difference, and I get the same result. I have already read the threads related to this problem, but haven't seen a solution that gets around creating a corrupted file in the first place. I don't have a file to share as I keep deleting them and trying again. I feel like maybe I'm doing something wrong during the file saving process inside Audition. I thought all you had to do was save it to a folder on your computer as long as it was saved in .sesx format. I do always mark yes when it asks to save files located outside the session, if that matters at all. Any help would be appreciated! Thanks!