wstring PluginDataStorage::StartUploadValue	(	wstring	wstrPluginName,
		unsignedLong	nValueSize
	)

Add or replace value URL for specified key in the Plugin Data Storage.

Parameters:

wstrPluginName	(wstring) productname and version divided by slash (e.g. '1093/1.0.0.0', '1103/1.0.0.0', 'KES/10.2.2.0'), up to 256 chars. See List of KLHST_WKS_PRODUCT_NAME and KLHST_WKS_PRODUCT_VERSION values for some products.
nValueSize	size of the value, cannot be more than 50 Mb (SC13.1)

Returns:: URL on KSC server to upload file to, see Files upload URL becomes invalid when file is uploaded, or after server is restarted.