Resolution

Step-1: Setup subscription datasource:

Step-2: Configure subscription for file share:

Hover mouse on the report and click on the dropdown or 3 dots on the right of report's name and select Manage
Click on Subscriptions in the left navigation menu and click on + New subscription
After picking a name for the subscription, select the option Standard subscription
Click on Edit Schedule hyperlink to configure schedule for this report.
Pick the option Windows File Share from destination dropdown.
Provide appropriate values for fields File Name, Path and Render Format
For the field Credentials used to access the file share, select the option Use the following Windows user credentials
A windows account with write permissions to the folder mentioned in field Path must be entered here
Select the appropriate setting for Overwrite options and click Apply

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