@acug @GodspeedFx @rodndtube
Sorry for any inconvenience this may have caused.
Google has restricted the access to external SD card in Android 4.4.x. Any devices with Android 4.4.x will experience issues when trying to manage files in exSD.
If your device has been rooted, you may edit the permission on the device:
http://forum.airdroid.com/discussion/12206/#Item_3
If you have a Samsung device, you may contact
support@airdroid.com to get the workaround on this issue (the workaround may not work well on all devices).