Ensure your printer has been set up, connected, and the driver installed. If you are unsure how to set up your printer and install the driver. Most printer drivers can be found on their website (e.g., Dnp.com). If you have trouble finding your driver, contact your print manufacturer via their website for assistance.

Check your firewall and ensure it is disabled & if you don't know how to find it (Search by typing 'firewall' on a Windows PC), note that Windows OS has three firewalls, and all three need to be disabled.

If you can find the printer on the print server and you can print a test page without using the snappic app, but cannot print when using Snappic, then it is possible that your connection is not good enough. Testing with a mobile hotspot is a great way to test different network connections, as interference can cause a problem.

Double-check your printer connections to the PC via USB. Sometimes changing the USB slot may help.

Disable your anti-virus firewall.

On your iPad, in Settings, go to Privacy > Local Network to see a list of every app that requested access. Please ensure Snappic has been granted access.

Your printer might show as offline, try unplugging & restarting the printer, then try a test print from your computer without using a Snappic. (The printer queue will have the 'Offline' text below or next to the printer name) If you see this, then you need to reconnect the printer or uncheck the offline toggle

Have a look at the print server to confirm the printer selected is the correct one. Sometimes a printer can create a 'Copy', so you must test your printers once again to ensure the correct copy is selected on your print server. If you see multiple printer options (for example, DNP rx1 copy - DNP rx1 copy 2), Then try each copy to see which one works, or you can delete the copy printers from your printer management system on the Operating system (Windows or MAC).

A restart is one possible solution, but this will only work if there are no other underlying issues.

Check your Firewall as it might have been reactivated (If you use an anti-virus, ensure the firewall within the anti-virus has been disabled until 'restart'.
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Ensure the 2-inch cut option is enabled on your print server. You can use the below guide to see where you can set up the print server. (Windows Print Setup )(Mac print server setup)

When using the link above, scroll down to the end of the guide for the print server setup steps.

Restart, then try print again if all else fails.

If you are using a Mitsubishi Printer and you cannot seem to get the 2-inch cut, then please do ensure your Page attributes & Paper handling are both set to the 5x15x2 type 1 option to cut (In some cases, Type 2 can also work)
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If your print session is working but seems like the orientation is "off", you can start by looking at the 'Transpose Orientation' option on the snappic print server, which has been checked or unchecked on your event. Do a test with both options, as some printers need it selected while others need it unchecked.

If the transpose orientation option does not work, you can also try changing your print from 4x6 to 6x4, for example, as this will also flip the image.

This issue might stem directly from your printer. Check the printer ribbons or your color cartridges ( depending on your printer ), as there might be an issue with their placement within the printer. You might also need new ones if all else fails. The best test for this would be printing from your PC without snappic to see if the result is the same.
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If you can find the printer and connect it to the print server and the iPad but still don't get any prints, then it's possible that your wifi network might have interference. You can try using a mobile phone as a hotspot or alternative connection to test.

Never use venue wifi. If you have no wifi dongle, use a mobile phone as a hotspot.

Keep a backup USB cable & lightning cable just in case you need to do

Just so you know, you can print after your event when you can get hold of a wifi connection.
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When 4x6 cuts in half, it generally means the 2-inch cut has been enabled. You can access the print server and change the configuration to disable the 2-inch cut. On the Windows print server, this will be found within the printer page selection after clicking on 'advanced', and the Mac print server will have this option once