I have discussed the Spotlight option with our developers.
They informed me that until the 3.6 update, sometimes Spotlight index was working in CloudMounter, but not with all drives/folders. However, the results were not perfect.
Starting from 3.6 update, when the "Mount as network drive" option was removed from the app (this option allowed to work with the drive as with network disk), Spotlight Index is not supported by CloudMounter.
We appreciate your time and patience.