Best way to link agnostically files outside vault across platforms

I am exploring the most effective method to link files from outside the vault, ensuring compatibility across different platforms, particularly Android mobile devices and Linux desktops. I also own a Synology device, which might be of assistance.

The links don’t necessarily need to be “clickable,” but I require an efficient way to link to the folder/path while composing notes. Ideally, this would involve some type of auto-completion feature (similar to linking in a terminal), which would facilitate quicker linking of file paths in notes.

What would you recommend as the best option?