minitbits has the advantage of being a native app and doesn't run into background issues.

cashu.me installed as a PWA has also been working really well for me.

you have to go into either one's settings and use the NWC string. basic idea: you copy a NWC string from any compatible wallet, and then in Amethyst you long-press on the zap icon on a note, then in the popup you find the NWC area and tap the clipboard icon.

that should paste the relevant NWC bits.

now when you zap, ir should initiate actions in the wallet.

some wallets need you to open them up and have them in the foreground to process it.

let me know if you have questions