SPIFFS Not Defined for NodeMCU 1.0 (ESP-12E Module), 80 MHz, Flash, Disabled, 4M (no SPIFFS), v2 Lower Memory, Disabled, None, Only Sketch, 115200

[vaemc]

Clicking 'ESP8266 Sketch Data Upload' will display an error

[GarveyZuo]

tool -> flash-size -> choose 3M spfss

[msvadakkan]

not working showing the same error

[rohoop]

same here

[Lassska]

tools / Erase Flash / All flash contents (for first upload)
tools / Flash Size / 4M (1-2-3M SPIFFS)
done