WIFI Kit 32 ESP32 data upload tool - files not visible / flash size?

I observed that I can not see/access the files uploaded with the data upload tool on the Wifi Kit 32 ESP. The upload works without an error.
What I’m wondering als well is that the tools says I do have a flash size of 4M but if I format the flash manually it shows a size of ~1.5M.
I tried it with “LittleFS” and “ESP_MAIL_DEFAULT_FLASH_FS” ( as I was supposte to use it)

any hints ?

You can search the partition table of ESP32.