I am running JabRef 5.2 on a Ubuntu 20.04 system.
On my hard disk, I have a folder with my Mendeley files.
In JabRef, I have loaded the corresponding bib file.
I have read this help page in order to link the entries in JabRef to their corresponding pdf files in the Mendeley folder, to no avail.
The link set in both /Options/Preferences/Linked files and /Library/Library properties are ignored.
What can I do to make this work?