diff --git a/dashcam-transfer-mount.sh b/dashcam-transfer-mount.sh
new file mode 100755
index 0000000..ce8a627
--- /dev/null
+++ b/dashcam-transfer-mount.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+# Mount SD card by UUID and start dashcam transfer.
+# Called by udev rule 99-dashcam-trigger.rules via systemd-run.
+# systemd-run is used (not direct udev exec) because udev context
+# lacks mount/umount permissions on Fedora with SELinux enforcing.
+UUID=/dev/disk/by-uuid/00D3-7715
+logger -t dashcam-transfer Trigger: SD card detected
+for ((i=0; i<60; i++)); do
+    if [ -e "$UUID" ]; then
+        logger -t dashcam-transfer Trigger: device ready after ${i}s
+        break
+    fi
+    sleep 1
+done
+while mountpoint -q /mnt/sdcard 2>/dev/null; do
+    umount /mnt/sdcard 2>/dev/null || break
+done
+mount "$UUID" /mnt/sdcard -o uid=1000,gid=1000,fmask=0000,dmask=0000 2>/dev/null
+if [ $? -eq 0 ]; then
+    logger -t dashcam-transfer Trigger: mounted, starting transfer
+    systemctl start dashcam-transfer
+else
+    logger -t dashcam-transfer TRIGGER ERROR: mount failed
+fi
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