Thanks for your interest in Syncfusion products.
We suggest you to use “importUrl” property to load the excel file and “ImportMapper” property is used to map the import controller action. Please refer below code snippets.
public ActionResult Import(ImportRequest importRequest)
Note: To open local files we can use “File -> Open” option in ribbon.
For your convenience, we have created a simple sample to demonstrate this and same can be downloaded from below link.
Please let us know if you need any further assistance.
We considered this “Importing excel file url from the control action on initial load” as an improvement task and a support incident has been created under your account to track the status of this requirement. Please log on to our support website to check for further updates.