The short answer is no. Ideally the "share drive" would not be read from by your reporting server and definitely not by letter-aliased file path. In reality it always depends. But in general it's not a good idea imo.
Are the 400 fingernails static? Are they logos and borders and buttons that don't change? Or are they images of xrays, profile pics, or pics that get replaced often?
Do you have access to an Azure blob storage or S3 storage account? I would use one of those. If the files are static make it read only and if you're concerned about speed/scalability then add a CDN (Content Distribution Network) service to the storage directory. If the files are replaced often then adjust the cache window in the CDN. I think Azure defaults to up to 24 hours for file replacement (which end users could find annoying).