No way to contact them for info about this buggy and illogical and dangerous app

It is impossible to ask them a question. You have to wade thru tons of “support’ documents, which really only support their bottom line, enabling them to get away without dealing with their customers. It is a very dangerous app as it can erase the original data on your computer if you are not careful. If you put your original data in their OneDrive folder on your computer, and something glitches it erases the data from your computer. The upload process is unclear. There was an error in uploading but no notification appeared, either on the website or on the local onedrive app for a day. The sort order of the files online is not clear and the data shown varies with files uploaded (synched) from their OneDrive folder and those dragged into a web window to upload. The uploaded files give a modified date which is the time it was uploaded to their site, (on their site) but does this mean they were compressed by them, modified in some other way, or is this really the “Uploaded” time stamp? If so the fact that it says “modified” shows you the overall lack of UI thought put into this system, despite the size and financial ability of Microsoft. Along with the inabiity to ask them a direct question, this makes this way of backing up a ridiculous risk to take. I signed up for a test of it. SAD SAD SAD that such a large company is so unable to do a simple thing like create a clear user interface. The problem with them and many other tech comapanies is that these apps are by by techies who love to dwell on a computer and mess around with it, fiburing things out, for whom the means has become the end, and not by USERS who are just interested in using the app to do what it should without having to mess around with it. I’ve seen this often in apps these days.
While I am writing this, the One drive app just crashed in the background (Mac El Capitan). I rate this a useless and frustrating app because you will never be sure it is working. It does not even show you the number of files on a screen so you could check to see if the number of uploaded files matches the number in your original folder on your computer which you have tried to synch.

Elliott Landy about OneDrive, v17.3.6389.