10k limit on esp8266

thanks Gordon, the file success send, but if i want save it - i have error:

>save()
=undefined
Erasing Flash.....
Writing............................
ERROR: Too big to save to flash (26151 vs 12284 bytes)
Deleting command history and trying again...
Erasing Flash.....
Writing......................
ERROR: Tooàþ
 ets Jan  8 2013,rst cause:4, boot mode:(3,7)
wdt reset
load 0x40100000, len 2408, room 16
tail 8
chksum 0xe5
load 0x3ffe8000, len 776, room 0
tail 8
chksum 0x84
load 0x3ffe8310, len 632, room 0
tail 8
chksum 0xd8
csum 0xd8
2nd boot version : 1.6
  SPI Speed      : 80MHz
  SPI Mode       : QIO
  SPI Flash Size & Map: 32Mbit(512KB+512KB)
jump to run user1 @ 1000

Disconnected

esp12 have 4mb flash memory, why it's say what i have 12284 bytes?