How to mint a custom test collection
Not only does Nifty Bridge allow you to mint a custom collection, you may also create a custom test collection. A custom test collection will allow you to see what the NFT will look like on a secondary market with your own storefront on the test networks.
To start, enable test mode inside of the "settings" tab and make sure the box is checked before hitting "save changes"
Once enabled, navigate to the Collections tab and mint a collection the same way you would a normal one. This time you will see the option to create a test collection instead of a normal one. You can create both Polygon and Ethereum test collections.
If you want to mint on a test collection you must select that collection in the test network settings as seen below.