Printing on 80mm bluetooth Pos Printer

Printing on 80mm bluetooth Pos Printer

Hello. I am trying to print receipts and invoices using my 80mm bluetooth connectivity Pos printer. I have configured the Templates to Retail so that it matches the paper width of the Pos printer. However, when I click Print in zoho, first it opens the receipt in my pdf reader app and when I search among printers, the Bluetooth printer ain't among even when it's paired with the phone. I have tried to add the printer but then there is only option of using Wifi- Direct IP address which the Bluetooth printer doesn't have. Saving the pdf on my phone and trying to share it via Bluetooth to the printer, the printer is not visible. How do I get Zoho to print directly to the Bluetooth printer?