If your scene requires the use of an irradiance map, log in to your ftp account and mimic the scenes path.
Set the irradiance map to a specific drive, except for the C drive. If you only have the C drive, then you can manually change the path in your scene. For the following example, we set the path the D drive.
Once, you have mimicked the path upload the irradiance map.
Log in to your ftp account and right click over the irradiance map. Scroll down and select Upload option.
As soon as the upload is complete the irradiance map will load properly.
If you need any further assistance, please email us at firstname.lastname@example.org