okay, that gives me A LOT more information, but it doesn't tell me how to change the password for accessing my QNAP...
any OTHER clues? i feel like i'm almost there...
dbus debug: Getting All properties
dbus debug: Getting All properties
dbus debug: Getting property Position
dbus debug: Getting All properties
dbus debug: Getting All properties
dbus debug: Getting property Position
main debug: processing request item: null, node: Playlist, skip: 0
main debug: rebuilding array of current - root Playlist
main debug: rebuild done - 8 items, index -1
main debug: starting playback of new item
main debug: resyncing on 01 - file.flac
main debug: 01 - file.flac is at 0
main debug: creating new input thread
main debug: Creating an input for '01 - file.flac'
main debug: requesting art for new input thread
main debug: using timeshift granularity of 50 MiB
main debug: using default timeshift path
main debug: `smb://
admin@qnapnas.local/path/to/music/file.flac' gives access `smb' demux `any' path `
admin@qnapnas.local/path/to/music/file.flac'
main debug: creating demux: access='smb' demux='any' location='
admin@qnapnas.local/path/to/music/file.flac' file='(null)'
main debug: looking for access_demux module matching "smb": 18 candidates
main debug: no access_demux modules matched
main debug: creating access: smb://
admin@qnapnas.local/path/to/music/file.flac
main debug: looking for access module matching "smb": 30 candidates
dbus debug: Getting property Position
qt debug: IM: Setting an input
main debug: looking for meta fetcher module matching "any": 1 candidates
lua debug: Trying Lua scripts in /home/salamandir/.local/share/vlc/lua/meta/fetcher
lua debug: Trying Lua scripts in /usr/lib/x86_64-linux-gnu/vlc/lua/meta/fetcher
lua debug: Trying Lua scripts in /usr/share/vlc/lua/meta/fetcher
main debug: no meta fetcher modules matched
main debug: looking for art finder module matching "any": 2 candidates
lua debug: Trying Lua scripts in /home/salamandir/.local/share/vlc/lua/meta/art
lua debug: Trying Lua scripts in /usr/lib/x86_64-linux-gnu/vlc/lua/meta/art
lua debug: Trying Lua playlist script /usr/lib/x86_64-linux-gnu/vlc/lua/meta/art/00_musicbrainz.luac
lua debug: skipping script (unmatched scope) /usr/lib/x86_64-linux-gnu/vlc/lua/meta/art/00_musicbrainz.luac
lua debug: Trying Lua playlist script /usr/lib/x86_64-linux-gnu/vlc/lua/meta/art/01_googleimage.luac
lua debug: skipping script (unmatched scope) /usr/lib/x86_64-linux-gnu/vlc/lua/meta/art/01_googleimage.luac
lua debug: Trying Lua playlist script /usr/lib/x86_64-linux-gnu/vlc/lua/meta/art/02_frenchtv.luac
lua debug: skipping script (unmatched scope) /usr/lib/x86_64-linux-gnu/vlc/lua/meta/art/02_frenchtv.luac
lua debug: Trying Lua playlist script /usr/lib/x86_64-linux-gnu/vlc/lua/meta/art/03_lastfm.luac
lua debug: skipping script (unmatched scope) /usr/lib/x86_64-linux-gnu/vlc/lua/meta/art/03_lastfm.luac
lua debug: Trying Lua scripts in /usr/share/vlc/lua/meta/art
main debug: no art finder modules matched
main debug: looking for meta fetcher module matching "any": 1 candidates
lua debug: Trying Lua scripts in /home/salamandir/.local/share/vlc/lua/meta/fetcher
lua debug: Trying Lua scripts in /usr/lib/x86_64-linux-gnu/vlc/lua/meta/fetcher
lua debug: Trying Lua scripts in /usr/share/vlc/lua/meta/fetcher
main debug: no meta fetcher modules matched
main debug: looking for art finder module matching "any": 2 candidates
lua debug: Trying Lua scripts in /home/salamandir/.local/share/vlc/lua/meta/art
lua debug: Trying Lua scripts in /usr/lib/x86_64-linux-gnu/vlc/lua/meta/art
lua debug: Trying Lua playlist script /usr/lib/x86_64-linux-gnu/vlc/lua/meta/art/00_musicbrainz.luac
lua debug: Trying Lua playlist script /usr/lib/x86_64-linux-gnu/vlc/lua/meta/art/01_googleimage.luac
lua debug: Trying Lua playlist script /usr/lib/x86_64-linux-gnu/vlc/lua/meta/art/02_frenchtv.luac
lua debug: Trying Lua playlist script /usr/lib/x86_64-linux-gnu/vlc/lua/meta/art/03_lastfm.luac
lua debug: Trying Lua scripts in /usr/share/vlc/lua/meta/art
main debug: no art finder modules matched
main debug: looking for keystore module matching "any": 4 candidates
main debug: using keystore module "kwallet"
main debug: removing module "kwallet"
smb error: open failed for '
admin@qnapnas.local/path/to/music/file.flac' (Unknown error 8216)