in android code in FlutterStarPrntPlugin.kt is val imageUri: Uri = Uri.parse(it.containsKey("appendBitmap").toString())
which should be
val imageUri: Uri = Uri.parse(it.get("appendBitmap").toString())
And in iOS I guess it is not implemented.
} else if (command["appendBitmap"] != nil) {
} else if (command["appendBitmapText"] != nil) {
in android code in
FlutterStarPrntPlugin.kt
isval imageUri: Uri = Uri.parse(it.containsKey("appendBitmap").toString())
which should beval imageUri: Uri = Uri.parse(it.get("appendBitmap").toString())
And in iOS I guess it is not implemented.