Now using iOS 14.5.1, with VLC 3.2.13.
For a long while, I remember not being able to use external subtitles when reading files on my NAS via a SMB share. The workaround was to download the files locally, but considering I store everything on my NAS it's pretty inconvenient. Sometime around last year, things were working fine, though I don’t remember the exact combination of and VLC versions. Now the current status on my side is basically :
* Subtitles embedded in an MKV file work fine, whether the file is local or in a network share
* External subtitles and video on local storage work as well
* External subtitles and video over SMB don't work
I can confirm that subtitles over SMB work fine on VLC for Android at least (tested from a FireTV).
Is it a limitation specific to iOS ? Or is it a bug and should I fill a proper report ?