[Bug]: "Failed to create a placeholder directory file" on /media/something, max Flatseal permissions

[mrmatteastwood]

Describe the bug

Flatseal settings:

When attempting to create a new bottle in /Media/Mattland/Wine Bottles, this happens:

Background:

I set up Bottles a few months ago and ran a few games with it, they were all working fine after some tinkering. I tried 2 games yesterday and they no longer ran properly, Rayman Redemption wouldn't run in 16:9 (squished to 4:3 in full screen) and the Blake Stone source port, "Bstone" wouldn't start at all or it would crash when attempting to enter gameplay. I tried with different launchers than the default Soda, which just made matters worse.

I deleted the bottle and tried to set up a new one, which led to the issue above.

Other things I've tried:

Uninstalled Bottles, then ran flatpak uninstall --unused, flatpak repair --user and sudo flatpak repair, re-installed Bottles, double-checked Flatseal settings. Same result.

Tried installing the bottle in my home folder, works like a charm.

My system info:

https://termbin.com/7msw

To Reproduce

1. Open Bottles
2. Try to create a bottle on /media/something

Package

Flatpak from Flathub

Distribution

Linux Mint 22.1 Cinnamon

Debugging Information

Official Package: true
Version: '51.18'
DE/WM: cinnamon
Display:
    X.org: true
    X.org (port): :0
    Wayland: false
Graphics:
    vendors:
        nvidia: &id002
            vendor: nvidia
            envs:
                __NV_PRIME_RENDER_OFFLOAD: '1'
                __GLX_VENDOR_LIBRARY_NAME: nvidia
                __VK_LAYER_NV_optimus: NVIDIA_only
            icd: /usr/lib/x86_64-linux-gnu/GL/vulkan/icd.d/nvidia_icd.json
            nvngx_path: /usr/lib/x86_64-linux-gnu/GL/nvidia-560-35-03/extra/nvidia/wine
        intel: &id001
            vendor: intel
            envs:
                DRI_PRIME: '1'
            icd: /usr/lib/x86_64-linux-gnu/GL/vulkan/icd.d/intel_hasvk_icd.x86_64.json:/usr/lib/x86_64-linux-gnu/GL/vulkan/icd.d/intel_icd.x86_64.json:/usr/lib/i386-linux-gnu/GL/vulkan/icd.d/intel_hasvk_icd.i686.json:/usr/lib/i386-linux-gnu/GL/vulkan/icd.d/intel_icd.i686.json
    prime:
        integrated: *id001
        discrete: *id002
Kernel:
    Type: Linux
    Version: 6.8.0-53-generic
Disk:
    Total: 16628346880
    Free: 16628158464
RAM:
    MemTotal: 31.0GiB
    MemAvailable: 22.7GiB
Bottles_envs: null

Troubleshooting Logs

~$ flatpak run com.usebottles.bottles
11:34:26 (INFO) Launching with URI: None 
11:34:26 (INFO) [Activate] request received. 
11:34:26 (INFO) Bottles Started! 
MESA-INTEL: warning: ../src/intel/vulkan/anv_formats.c:782: FINISHME: support YUV colorspace with DRM format modifiers
MESA-INTEL: warning: ../src/intel/vulkan/anv_formats.c:814: FINISHME: support more multi-planar formats with DRM modifiers
11:34:26 (INFO) Performing Bottles checks… 
11:34:26 (INFO) Dxvks found:
	 - dxvk-2.5.1
 
11:34:26 (INFO) Vkd3ds found:
	 - vkd3d-proton-2.13
 
11:34:26 (INFO) Nvapis found:
	 - dxvk-nvapi-v0.7.1
 
11:34:26 (INFO) Latencyflexs found:
	 - latencyflex-v0.1.1
 
11:34:26 (INFO) Runners found:
	 - soda-9.0-1
	 - caffe-9.7
	 - vaniglia-8.6
	 - lutris-ge-lol-p8-12
	 - wine-ge-proton8-26
	 - kron4ek-wine-9.22-amd64
	 - sys-wine-9.0
 
11:34:26 (INFO) Temp directory cleaned successfully! 
11:34:26 (ERROR) Config file not exists 
Traceback (most recent call last):
  File "/app/share/bottles/bottles/backend/models/config.py", line 183, in load
    raise FileNotFoundError("Config file not exists")
FileNotFoundError: Config file not exists
11:34:26 (ERROR) Config file not exists 
Traceback (most recent call last):
  File "/app/share/bottles/bottles/backend/models/config.py", line 183, in load
    raise FileNotFoundError("Config file not exists")
FileNotFoundError: Config file not exists
11:34:26 (ERROR) Config file not exists 
Traceback (most recent call last):
  File "/app/share/bottles/bottles/backend/models/config.py", line 183, in load
    raise FileNotFoundError("Config file not exists")
FileNotFoundError: Config file not exists
11:34:26 (INFO) Catalog installers loaded 
11:34:26 (INFO) Catalog dependencies loaded 
11:34:26 (INFO) Catalog components loaded 
Wine Bottles
11:35:05 (ERROR) Failed to create placeholder directory/file at: /media/Mattland/Wine Bottles/MyLittleBottle

Additional context

No response