Wemos D1 Mini ESP8266 Sketch Data Upload

I am having issues with using the ESP8266 Sketch Data Upload.

I have followed the instructions regarding placing a file in the "data" folder of my sketch. However I get the error:

"esptool write_flash: error: argument : Must be pairs of an address and the binary filename to write there"

"SPIFFS Upload Failed!"

I have the latest version of the Arduino IDE and Python 3.8 64 bit installed on Windows 10

If I use a sketch to query the D1 Mini filesystem using SPIFFS it returns results OK so I assume this is an issue with the IDE/upload.py/Python

I have seen that the file system uploader says it's been tested with IDE versions "1.6.5-r2, 1.6.6" but I don't want to downgrade as the older versions don't seem to work with my D1 mini V3

Thanks Juraj!