Looks like I cannot confirm uploading of my addon using addon depot procedures. Despite of all my efforts (I tried both FTP and HTTP ways) I still have error messages that config copy and both demo images not found. Using my FTP client I can see all needed files uploaded to corresponding OFPEC folders, but site software gives me a confirmation only about addon .zip file and ignores the rest.
So maybe someone responsible can check this situation.
P.S. And my addon (original AH6/MH6 chopper set) is already there.