I have a TrueNAS server at home and thought I could easily connect it to my phone (Pixel 7) as a network drive but was surprised to learn that Android doesn’t have a built in feature for that.
iOS/iPadOS does have this to my surprise built in via the ‘Files’ app.
Or did I just not look hard enough in the Android settings? (I know there are 3rd party apps for this)
If it is WebDAV, DAVx5 has a feature that makes those shares available as a local volume. An sFTP app can be used to xfer files.
TrueNAS probably has a service for synchronized folders like google drive. I don’t know how to access NFS or SMB transparently.