You can install the test app from the Play Store using the URL
Thanks for this.
The good news is that it installed easily on my Samsung tablet and has no issues demanding I use the root directory.
The bad news is that when syncing (from MB to the device) for every file that is to be deleted from the device, there is a pop-up asking if I will allow MB WiFi Sync to delete the file. I can choose "Deny" or "Allow." It's been quite some time since I performed a sync on this device and there are 17,285 files to be deleted. No one should have to click "Allow" 17,285 times. Especially after it's initial scan, it asked me if I wanted to delete 17,285 files. That one-time ask should be enough.
I can see behind the Deny/Allow window that some syncing is taking place. I can see that it is deleting files and I can see under that line the beginning of the name of the file that is being deleted. So it's working. But the pop-up really interferes with my ability to monitor the sync.
The screen timeout on the device is set for five minutes. But the WiFi app closes after about a minute. Apparently it's still running, but my screen goes black and returns to the home screen. I then have to tap the WiFi Sync app icon to get back to watching the pop-ups.
In addition, at about 5% complete, the app closed and had to be restarted. I could only do that by restarting the tablet.
This most recent time that the app closed and the screen went black and returned to the home screen I did not try to open the app. It appears to be running as MB's status bar is showing progress. In this state, I'm (obviously) not tapping "Allow" as the app isn't on the screen. Yet the sync proceeds. So the continuous asking for permission (other than the first time) is not necessary. But it really should not keep popping-up.
Again, thanks for doing this and I hope you can work out the things I've mentioned. Let me know if there's other information I can provide to get things stabilized.