SPIFFS + ESP32 Sketch Data Upload Problem

[smacyas]

Hardware:
Board: ?ESP32 Dev Module?
Core Installation/update date: latest
IDE name: Arduino IDE
Flash Frequency: 40Mhz?
Upload Speed: 115200

Description:
Hello.
I need help.
I have WROOM-32 ESP32 module.
In folder of my ino-project I created folder ‘data’ and put into it some files: css, html, txt by ESP32 Sketch Data Upload (https://github.com/me-no-dev/arduino-esp32fs-plugin), I have uploaded them successfully to my module.
When I try to read file from SPIFFS (previously mounted SPIFFS, of course) (latest arduino-esp32, https://github.com/espressif/arduino-esp32), listDir(SPIFFS, "/", 0) - OK; but while I use readFile(SPIFFS, "/style.css"); there is some trash, but no correct data. When I use write and read file, which was NOT uploaded by ESP32 Sketch Data Upload, it is OK.

Any ideas?
Thanks.

Sketch:
Debug Messages:
rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
ets_main.c 371
ets Jun 8 2016 00:22:57

rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:956
load:0x40078000,len:0
load:0x40078000,len:13076
entry 0x40078a58

Starting device...
ESP32 Chip ID: 9238022
FreeHeap: 126324
ChipRevision: 1
CpuFreqMHz: 240
SdkVersion: v3.1-dev-239-g1c3dd23f-dirty
FlashChipSize: 4194304
FlashChipSpeed: 40000000
FlashChipMode: 2

SPIFFS Mount succesfull:
Listing directory: /
FILE: /door.png SIZE: 846
FILE: /favicon.ico SIZE: 239
FILE: /index.html SIZE: 4875
FILE: /logo.png SIZE: 5075
FILE: /profile.png SIZE: 898
FILE: /style.css SIZE: 5844
FILE: /style.txt SIZE: 101
FILE: /variables.txt SIZE: 41

Started WiFi Station Terminal Access (STA) regim
Current SSID: myssid

ESP32 MAC STA: [D][WiFiGeneric.cpp:293] _eventCallback(): Event: 2 - STA_START
30:AE:A4:06:F6:8C
[D][WiFiGeneric.cpp:293] _eventCallback(): Event: 1 - SCAN_DONE
[D][WiFiGeneric.cpp:293] _eventCallback(): Event: 4 - STA_CONNECTED
[D][WiFiGeneric.cpp:293] _eventCallback(): Event: 7 - STA_GOT_IP

WiFi connected
WiFi channel: 1
WiFi RSSI: -56
192.168.200.162
Reading file: /style.css
Read from file: яяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяяя