How do you mount an FTP filesystem on GNU/Linux so that you can access it in a graphical file manager? Well, unlike Windows Explorer, there generally is no function built-into the graphical file manager for special handling of FTP servers, so you must do a FUSE mount yourself as follows.
apt-get install curlftpfs
mkdir /mnt/my_ftp
curlftpfs -o allow_other ftp-user:user@email /mnt/my_ftp/
20190223/DuckDuckGo linux mount ftplinux mount ftp
20190223/https://linuxconfig.org/mount-remote-ftp-directory-host-locally-into-linux-filesystem
20190223/https://www.linuxnix.com/mount-ftp-server-linux/
Gosh, I must say. Even on GNU/Linux, mounting Samba shares is easier than mounting FTP shares. On a typical desktop distro, I can mount Samba shares right out of the box, for for FTP shares, I have to install an additional package. So, I guess the winner-take-all solution for graphical file manager shares between Windows, GNU/Linux, and Mac OS X is Samba. I was really hoping I could avoid using Samba due to its reputation of being insecure and getting blocked by antivirus software, but it looks like it is the only technical way to make graphical file manager sharing work with ease. Otherwise, you have to use an upload-download workflow, unless your entire editing application is also implemented as a web app.