[Unit]
Description=Trigger to copy files from camera SD to Photoprism
Requires=media-whateverthesd\x2dcardidis.mount
After=media-whateverthesd\x2dcardidis.mount

[Service]
ExecStart=/home/whereverthethingis/copy.sh

[Install]
WantedBy=media-whateverthesd\x2dcardidis.mount