Here’s an example in Airtable, by the way, that took <5 min to make.
Spreadsheet view: Airtable - Estate Sale Demo
Gallery view (automatically created from the spreadsheet data):
https://airtable.com/appEh0ExaaJYnwGUu/shriKTkOrWIwsekwN/tbl1zJ96LF0qBX5gP/viwniCxP0EZ4TSsuH
This would probably fit under their free plan. You can import your existing spreadsheet and just paste images into a new column. The gallery is automatic. It ends up looking much better than a Google Sheet / Excel, and you don’t have to worry about external photo hosting. And there’s no annoying ads or distracting related content, like on most free photo hosting sites.