Arduino Yún has analog pins A0-A5, but in the Blynk app with a Yún selected, the available pins jump from A3 to A6. Why this is?
Arduino Yun has 12 Analog Pins and all of them are reflected in the app. There could be only one reason why they are not available: you have already used them and they are busy.
Check all the widgets, in the right top corner they usually show which Pin was assigned to this widget.
I now re-checked and see that actually it may be missing for some reason.
We will fix that in next app version.
Thanks for reporting!
Ah, yes, Analog IN pins A0-A5. Sorry for the confusion.