Hello!
I’m running HAOS alright, but I need 3 firmware files for my DVB-T2 USB stick stored persistently under /share/ (well, I assume that this would be the right place to get them loaded upon boot with the correct boot parameters). The problem is that after a reboot, the folder /share/ is empty again, i.e. files stored there do not seem to survive a (re)boot.
Am I maybe missing something obvious? Can somebody with more profound knowledge please nudge me into the right direction? I appreciate your help very much - thank you! 
PS for your information, showing the 3 firmware files (last 3 rows) I stored there (before they vanish after a reboot):
| | | | /\ (_) | | | |
| |__| | ___ _ __ ___ ___ / \ ___ ___ _ ___| |_ __ _ _ __ | |_
| __ |/ _ \| '_ \ _ \ / _ \ / /\ \ / __/ __| / __| __/ _\ | '_ \| __|
| | | | (_) | | | | | | __/ / ____ \\__ \__ \ \__ \ || (_| | | | | |_
|_| |_|\___/|_| |_| |_|\___| /_/ \_\___/___/_|___/\__\__,_|_| |_|\__|
Welcome to the Home Assistant command line.
System information
IPv4 addresses for eth0: 192.168.11.55/24
IPv6 addresses for eth0: xxxx::xxxx:xxxx:xxxx:xxxx/64
IPv4 addresses for wlan0:
OS Version: Home Assistant OS 10.3
Home Assistant Core: 2023.7.3
Home Assistant URL: http://homeassistant.local:8123
Observer URL: http://homeassistant.local:4357
➜ ~ ll /share
total 16K
-rw-r--r-- 1 root root 2.7K Jul 23 20:53 dvb-demod-si2168-02.fw
-rw-r--r-- 1 root root 6.8K Jul 23 20:54 dvb-demod-si2168-b40-01.fw
-rw-r--r-- 1 root root 2.1K Jul 23 20:53 dvb-usb-it9303-01.fw