Issue with vsftpd and camcorder on Pi4B

I'm using-or more accurately trying to use-a Pi4B as an FTP server to eventually remotely transfer clips from an internet-capable camcorder (a Canon XF605 if that's important).  Anyway I managed to get it all working briefly until a few months back.  Now when I try transferring from the camera to the server the camera tells me it received an error code from the server.
I'm afraid Canon doesn't help much when it comes to diagnosing what the issue the server has with the camera is, but when I go to vsftpd's log it seems the camera is trying (and failing) to create a subdirectory in my home directory instead of doing what it used to-just write to the directory I told it to in its settings.  That directory, by the way is a USB-connected hard drive mounted in the /media directory.  I have no problem connecting to the server and accessing the drive using the FileZilla client on my laptop, which leads me to believe the camera's FTP client got hosed up somehow with the last firmware update from Canon, whici is when I think this started.
Frankly, that wouldn't suprise me since that client wasn't worth much to start with-it doesn't support SFTP,  for instance, despite its being supposed to-which is why I had to install vsftpd instead of relying on the Pi's built-in SFTP/SSH support.  Anyway, I thought I'd run this by the group to see if anyone had any ideas as to whether anything could possibly be done on the Pi or in vsftpd that would help.  If not, it'll be another round of me vs. Canon.  Thanks in advance for any suggestions.