Hi Kurt.
Can you tell me exactly the error that you get?
Regards,
Sara

Arduino:1.8.10 (Mac OS X), Kort:”NodeMCU 1.0 (ESP-12E Module), 80 MHz, Flash, Legacy (new can return nullptr), All SSL ciphers (most compatible), 4MB (FS:1MB OTA:~1019KB), 2, v2 Lower Memory, Disabled, None, Only Sketch, 115200″
Executable segment sizes:
IROM : 265916 – code in flash (default or ICACHE_FLASH_ATTR)
IRAM : 26696 / 32768 – code in IRAM (ICACHE_RAM_ATTR, ISRs…)
DATA : 1240 ) – initialized variables (global, static) in RAM/HEAP
RODATA : 1680 ) / 81920 – constants (global, static) in RAM/HEAP
BSS : 25136 ) – zeroed variables (global, static) in RAM/HEAP
Sketch uses 295532 bytes (28%) of program storage space. Maximum is 1044464 bytes.
Global variables use 28056 bytes (34%) of dynamic memory, leaving 53864 bytes for local variables. Maximum is 81920 bytes.
[SPIFFS] data : /Users/kurt/Documents/Arduino/spiffs_test/data
[SPIFFS] size : 1000
[SPIFFS] page : 256
[SPIFFS] block : 8192
/test_example.txt
skipping .DS_Store
[SPIFFS] upload : /var/folders/gz/w3h52cpj2475jh4js9krskf40000gn/T/arduino_build_17076/spiffs_test.spiffs.bin
[SPIFFS] address : 0x300000
[SPIFFS] reset : –before default_reset –after hard_reset
[SPIFFS] port : /dev/cu.usbserial-0001
[SPIFFS] speed : 115200
[SPIFFS] python : python
[SPIFFS] uploader : /Users/kurt/Library/Arduino15/packages/esp8266/hardware/esp8266/2.6.1/tools/upload.py
usage: esptool write_flash [-h] [–erase-all]
[–flash_freq {keep,40m,26m,20m,80m}]
[–flash_mode {keep,qio,qout,dio,dout}]
[–flash_size FLASH_SIZE]
[–spi-connection SPI_CONNECTION] [–no-progress]
[–verify] [–encrypt]
[–ignore-flash-encryption-efuse-setting]
[–compress | –no-compress]
<address> <filename> [<address> <filename> …]
esptool write_flash: error: argument <address> <filename>: Must be pairs of an address and the binary filename to write there
SPIFFS Upload failed!
This report would have more information with
“Show verbose output during compilation”
option enabled in File -> Preferences.

Hi Kurt.
That seems to be a recent issue with the plugin.
Read this discussion: https://github.com/esp8266/Arduino/issues/6777
They provide some suggestions to fix that issue.
I hope this helps.
Regards,
Sara