How set Transmission to wait for external disk

[frestalink]

Raspberry Pi 3+ with Libreelec 9.2.8
I tried create 'init.sh' on /storage/.kodi/addons/service.transmission/ with value /bin/sleep 30, but nothing happens, Transmission is initiaded before mount external disk.

[LmarLoe]

[Unit]
Description=Transmission
After=kodi.service multi-user.target network-online.target
Requires=multi-user.target network-online.target
ConditionPathIsMountPoint=/var/media/Ext_drive

[Service]
Type=forking
ExecStart=/bin/sh /storage/.kodi/addons/service.transmission/bin/transmission.start
Restart=on-failure

[Install]
WantedBy=multi-user.target
WantedBy=var-media-Ext_drive.mount

Replace Ext_drive with the label of your external drive

It is necessary to edit /storage/.kodi/addons/service.transmission/system.d/service.transmission.service directly

Stop/start transmission plugin in the kodi GUI.
Make sure that the appropriate symlinks are created for .service and .wants in /storage/.config/system.d