Where to place invoice folder for sales and secured data?

I am getting a Warning about invoice folder and secured data (see attached file) and have tried to do different things like making a folder called 'invoices' with another folder called 'secured_data' inside and uploading it to different places in the root - but with no success. I keep getting a message that the folder is placed the wrong place.

So where EXACTLY do I have to place the invoice folder?

PS: I have installed OTAnte quick start package.

Hope to get an advice on this issue as it seems to be pretty important as the warning pops up all the time. Thanx.

Problem is solved! The solution is to place the folder in /home/m/a/ftp_xxxxxxxxxxx/ - I found out myself