FTP link opens to blank page

Solution 1:

I tried this already with two different OS (Linux, Chrome OS) and browsers (firefox, chrome).

Firefox have removed FTP support since Firefox 88 -- April 19, 2021.

Google Chrome also have already removed FTP support since Chrome 88 -- December 3, 2020.

attempted to open an FTP of one my colleagues.

Use a good FTP client, or use a better file transfer protocol.