I dont. Its honestly not great. I’d rather that effort went to preserving and repairing the existing tools of the free and open web – the old protocols are extensible. Imagine if we had an RSS client with a “reblog” feature!
“Federation” adds overhead and honestly creates as many problems as it solves. It’s not a selling point, its a price tag.
syncthing is the easy option if you have some files you always want to have on both. if you just want to access your desktop files from your phone, I recommend Cx File Explorer for Android, it’s a file browser that supports various network file share protocols including Samba and SFTP.