Yes .. any upnp/dlna server, for me it's a Synology with minimserver for DSD and flac without any conversion as files files were on SD card on the R6Pro
You can browse files on :
-> Tidal and of course Qobuz (with subscription) at any Hires format, even 24bits/192khz.
-> And any files on dropbox, Onedrive and iCloudDrive ..
A printscren on my Ipad, on Iphone it is a bit different appearance in portrait mode.
Mconnect on Iphone or Ipad, basically, is just used to browse and search in music files (by artist/album/year/playlist/etc) and then and joining those files directly to Neutron Upnp/Dlna renderer on the R6pro as a playlist. For me it's the only way to apply any PEQ or GEQ to those music on-line to suit your headphone parameters/taste.
I tried Roon ... but it needs a PC somewhere and it's incompatible with many hardware like Hiby R6pro and basically not really better than mconnect to browse upnp servers or Qobuz just with an iphone or ipad..