How do I reference/interact with data in a linked sheet

How do I reference/interact with data in a linked sheet

Hello,

I've linked another Zoho worksheet to my project by using the Data > Link Spreadsheet function. The sheet appears to have been successfully linked, but I have no idea how to reference or interact with the data. I've tried unsuccessfully using the sheet name. I just need it to do a simple XLookup, so only need to know how to reference the linked range. Thank you in advance for any help you can provide!

Sean