Hi, i am using Tuya Smart life…
added 2 LEDs and 1 plug
after adding Tuya, my 2 led entitties are created, but i dont see the power plug
But the power plug is on a remote location, so different wifi … its connected i can toggle it with smat life app… But i dont see it in HA
is HA limited to local lan? i thought it was a cloud based component?
HA is a ‘local’ system, however, it can be used from the cloud by Nabu Casa
Still I am not sure if what you want is possible ( i understand the Tuya is not ‘tasmotized’ ?)
I am not sure if HA is the ‘controlling’ factor of Tuya cloud, or if it can be done from NabuCasa. As far as I understand, HA ‘converts’ the Tuya devices to local devices and then publishes them on NabuCasa.
First thing that pops my mind in this case is to use a VPN solution, so your remote Tuya would appear to be on the same network as your local Tuya devices 
Not all tuya devices are supported. Check if you see it if it is on the same WIFI.
The power plug was supported… I removed it from tuya and added it again on another wifi, but on same tuya account…
So I have 3 devices in my tuya app, but only see 2 in HA
You removed it from tuya. Did you also remove it from HA ?
I removed the tuya integration, readded it , but still don’t see the third device…
It should see it, also if it’s located in another wifi, since HA is pulling them from cloud