Thanks for the help! An additional problem is that there's no internet access on LSAF. I found a partial solution by downloading "https://yihui.org/tinytex/TinyTeX.tar.gz" and running
tinytex:::install_prebuilt(pkg={path to TinyTeX.tar.gz})
That installs to my Workspace and allows me to create PDFs there. It also installs a /.TinyTeX folder in my home directory.
The next thing I'd like to do is install tinytex_prebuilt in a common area where all users have access. I have access to such a common area but not to the system files themselves. I assume a /.TinyTeX folder would be created there but what further steps would be necessary to make that available to a general user? Should I create an environment variable in R or add the path to /.TinyTeX to the path environment variable?