FLAC not found in nested folder structure

For some reason, FLAC files are not found in a nested folder structure, but WAV files are.
How do I solve this?

Folder structure
../Multisamples

Custom Folder/Strings/Mics/Strings Mics Samples

FLAC files are not foundf for some reason, but WAVs in are.
SFZ is in ../Mics

default_path=Strings Mics Samples/ when I put the samples into the folder above (> Custom Folder/Strings/Strings Samples), but the SFZ stays in "Mics/" the samples are still not found "default path=../Strings Samples/"

This sounds like a known bug in the current version of Serum 2 where sample=../ does not work in combination with default_path.
We have a fix ready for the next update, the current workaround is to not use default_path if you need to go up directories.

But your mention about FLAC files not being found when WAVs are is confusing.
I'd need to see your actual sfz file to better understand.

I see okay. this is the code:

// Verve Strings Sustain ff Decca
// By Bold Void
// Copyright 2026 - All rights reserved

default_path=Strings Mics Samples WAV/

ampeg_attack=0.05 ampeg_release=1 loop_mode=loop_continuous offset_random=1000

sample=BVVerve STR Sus Decca 102 ff C1.wav lokey=C1 hikey=D1 pitch_keycenter=C1 offset=2500 tune=-2

sample=BVVerve STR Sus Decca 105 ff D#1.wav lokey=D#1 hikey=F1 pitch_keycenter=D#1 tune=5

and so on.
the < region > tags cannot be shown here btw.

the samples are found immediately as wavs in this nested setup - remember its located in Multisamples/Custom Folder/Strings/Mics/Strings Mics Samples but when I change the samples and naming to .flac it is not found anymore. The "not found" dialog opens up, I click on "start search" and viola they are found, but not when loading the SFZ initially.

also in this setup, the flacs are not found even when not using default_path=

sample=Strings Mics Samples/BVVerve STR Sus Decca 105 ff D#1.flac

If you hover your mouse cursor over a file name in the Missing Files dialog, you should see a tooltip revealing the full path that was tried.
Maybe that will provide a clue of what's going wrong.

If you can send (via Contact Us) a zip containing example sfz + flac that demonstrates the issue I will investigate.
I cannot determine the problem from only the information provided here.

I found the issue and solution for FLACs not being found when the samples are just one folder beneath the SFZ.
It has nothing to do with default_path=

The sample folder contains 700+ samples. The 25 samples that need to be loaded with the SFZ are not found. However, when I put those 25 samples in their own separate folder, they can be found.

TL;DR: When the sample folder contains too many samples, the loading breaks (it is unknown at exactly how many samples it breaks). It never breaks when the samples are in WAV though, even when there are 700+ in that folder.

I can still send you the SFZs and samples if you want to investigate it yourself.

There's no logical reason why Serum would care how many samples are in a folder, or what file extension is used.
My best guess is that you've encountered an SFZ parsing bug, but cannot be sure without the data to work with.

Nevermind, it works now after restarting my Macbook and Cubase. So I cannot replicate the "Bug" anymore. 😅