IIS not able to access shared network folder

Sorry if this has been answered. But I went through many posts, nothing worked for me.

First of all, I am new in IIS management. We have an app in IIS 8 and application pool is configured under a domain account(application Pools-->Advaced Setting-->Identity). Shared folder in a different server within our network, in same domain.

When we login to IIS hosted machine using the same domain account, this account can browse the shared folder. However, the web application is not able to find this path. Also, if we setup a shared folder in the same machine as the IIS server, our web application is able to find that location. So web application is able to find the location as long as they both are at same server.

Also, domain account was given access to shared folder.

Also, I am not sure how to get more logs. I see logs are setup at C:\inetpub\logs\LogFiles\W3SVC1, but it does not have any valuable information on this issue.

Thank you.