Duplicati cannot see the content of shared folders

Hello,

I've just installed the plugin duplicati on my OMV4 installation (OMV 4.1.26 running on Armbian on an Odroid XU4).
It works well except, when I select the source data folder, duplicati cannot see the content of the shared folders (either via /sharedfolders or via mount points in /srv).

For example, I can browse in all system folder (/root, /bin, /boot) and see the subfolders and files. However, I cannot browse into any folder that is referenced as a subfolders in OMV. In /sharedfolders, I can see the shared folders, but not their sub directories.
I tried to specify full path to a folder to backup, but the backup does nothing, it backs up 0 files.

In this picture, you can see I can browse into /opt, for example, but not in /sharedfolders/JF (I can assure you there are a lot of subfolders and file in JF) : https://1fichier.com/?zldsqtxgudwuojenfspw
In this picture, you can see the result of the backup, where 0 file have been backuped : https://1fichier.com/?1h6s8ekpuwez9bgjltl7

I think this is a permission / ACL issue, but I can't figure out how to fix that.

Any help?

Mhm it seems it could be caused by Mono and the filesystem : all my shared folders are on a 4TB XFS file system. According to this link , I should recompile Mono and/or Duplicati with the option D_FILE_OFFSET_BITS=64...

Well I don't know how easy it should be, I've no knowledge in Mono..