Problem:
When trying to build a SPIFFS image, you see an error message like
SPIFFS_write error(-10010): unknown error adding file! Error for adding content from www! /www/Inter-Light.27083fa6375bb9ef.woff2
Solution:
SPIFFS_write error(-10010): unknown
means that the filename is too long. SPIFFS only supports filenames with a maximum of 32 characters.
In our example, Inter-Light.27083fa6375bb9ef.woff2
is 32 characters long.
Hence, the solution is to shorten the filename of every file with a filename (including extension) of 32+ characters.