The Sun-Dragon has two flash devices for file storage. The operating system is located on an 8 GB eMMC and the data for the website held on a 256 GB micro SD card. The 256 GB drive is mounted to /mnt/sd and contains two directories: lost+found and webpages. The lost+found directory is standard for ext* file systems. I had created a symbolic link in the root directory of the file system called webpages that linked to to the SD card directory. This works fine when all operations are done on the local machine. However, when viewed from a remote system the link wasn't showing up. Presumably the symbolic link was attempting to resolve a path on the non-local system—a path that did not exist.
The solution was to make a special mount point, a bind mount point. I first created an empty directory in the roof file system called webpages, and then mounted it with the bind option:
mount --bind /mnt/sd/webpages /webpages
That did exactly what I desired, allowing remote computers to access to the webpages directory. To get this mount point on system start I added the following line to /etc/fstabs:
/mnt/sd/webpages /webpages none bind