You can click on the QR code, it should prompt you to open a wallet app. 

scanning is ok on multiple devices. Just a bit of extra hassle is you just have the one device. 

I failed with fedimint app and also Orangpill app. Coinos allowed me to paste the invoice in.

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pycan

Hey, thank you for testing the app!

I'm not sure what you mean that some wallets don't allow you to paste in an invoice. You should be fine just by scanning the QR codes (both when paying and claiming).