When mounting an iso with
udisksctl, first a loop device is created
/dev/loop0 then a second device
/dev/loop0p1 is used to mount it on
a filesystem location.
Querying for StorageAccess devices sometimes only returns the
device without the
/dev/loop0 device and the BackingFile property does not
Solution: query for StorageVolume instead which returns all loop devices:
Warning: Because StorageVolume returns more devices, the function
getDeviceFromBackingFile could be a little bit slower.