Playing your own files
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Playing your own files is not flawless in all conditions. If your files are on a USB disk, you can either connect it to the R7, or put the files on an SD Card that you can insert into the back of the R7. With the FiiO Music App, you quickly index the files and browse the catalogue and play music with ease.
When the music is on a network drive it becomes problematic. The network drive is configurable within the FiiO Music app, but the FiiO Music App cannot index these files. Browsing and playback is then fairly dramatic and actually unworkable.
Problematic with UPnP
The FiiO Music App can also read from a UPnP player, but that functionality is a joke. Your reviewer has his extensive music collection on a Synology NAS with AssetUPnP installed on it. The app sees the UPnP player, but you can’t search, only browse through a long list sorted alphabetically. This is terribly slow. Then, when you finally click on an album, the Music App sorts the tracks alphabetically instead of by track number. There is no other sorting order to be found. In short, utterly substandard implementation of UPnP. FiiO: do it adequately or do not offer it.
I am using the R7 with a Synology NAS running Emby server (https://emby.media/), works flawlessly and the Android app is very easy to use. The Fiio Music App is basically unusable.