Check that settings are correct for the download path.
If the file is more than 2mb check with settings of php on the server that it is set to allow files larger than 2mb to be uploaded.
Paths were and are correct... The files were there for about a week, and now they are gone.
Not sure where the php setting is you are talking about, the files were larger than 2mb and up for over a week then gone.
It appears the the files are converted when uploading to file names like "1_06_12_08_3_50_11" with no extension, only 3 of the original 7 remain.