Not a real "cloud" app, crashes...

First, which is not a problem per se, is that this works with the Synology network disks - you have to have that. And I do, which is fine. If you dont, this wont help.
Second, it hard crashes my iPhone. I had not yet had any hard crashes, until yesterday when I installed this app, and I got two of them. These are the hard crashes where the phone is completely frozen - no response to any of the buttons and the screen is frozen.
Third, this is not really a "cloud" app, like iCloud or Google Drive. You cant save a document from Microsoft Word on your iPad to your Synology disk. At least I couldnt find out how. (No problem with Google Drive, OneDrive, or Dropbox.) Instead it copies (synchs) the files from the shared folder(s) on your Synology disk to your iDevice. But since the file system in iOS is not user accessible, this is kind of useless.
Fourth, since its synching the files from your Synology folders to your iDevice, it can fill up the memory on your iDevice.
Maybe its useful if youre a developer and want to get at that stuff?

StuartDole about DS cloud, v2.10.0