The "maximum_size" of 434160 bytes is incorrect for the ESP8285 chip json.
The chip has 1M of data according to the datasheet (page 12, section 3.1.3). The arduino board section shows the size as 761840 bytes after discounting the spiffs too.
esp8285.menu.eesz.1M256.upload.maximum_size=761840
The "maximum_size" of 434160 bytes is incorrect for the ESP8285 chip json. The chip has 1M of data according to the datasheet (page 12, section 3.1.3). The arduino board section shows the size as 761840 bytes after discounting the spiffs too.
esp8285.menu.eesz.1M256.upload.maximum_size=761840
I think the value should be corrected.