I had a little issue with using with installation going to blank screen with a 504 error. Turns out that the installation process (writing tables to the database) took longer (2 mins 36 second) than the default timeout settings (120 seconds) in the webservice. Once I updated the webservice timeout to 360 seconds, the installation process continued to the end.

You instructions were spot on and worked for me.

So thanks!!

Packages installed:
MariaDB 10
PHP 8.2
Web Station from Synology NAS
phpMyAdmin (which also installed PHP 8.0 for some reason)

Web Station app
Web Service
Default Service, Edit, set HTTP to Nginx, PHP 8.2, Save
Script Language Settings: Edit User-defined PHP 8.2
extentions enabled: curl, mysqli, openssl, zip, zlib (without zlib it wouldn't let me add languages or access Repository during setup)

phpMyAdmin app
created a new database called frontaccounting
then created a new user

File Station app
copy FA files to web/frontaccounting
set http read/write permission for frontaccounting folder, including sub-folders

Issues encountered:
In the beginning I was setting things up with Apache HTTP Server 2.4 service
when running the browser with the address IP/frontaccounting   the page wouldn't load giving some page errors.
Once I switched the back-end server to Nginx, things just started working.