esp32 32E heap memory question

[Gaston1980]

Hi to all, Im using the esp32 wroom 32E with vscode to test http connnection. Im sending data to a server suing client multipart header.
First of all I printf the heap memory available with:

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heap_caps_get_free_size(MALLOC_CAP_8BIT)

which give me:

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HEAP SIZE FREE 189956

If Im using an array of lenght 38KB and then I change the default value of the buffer in esp_http_client.h to 10KB, If I try to increase the client buffer to 15KB using malloc I got "not memory?

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    if((buffer=(char *)malloc(15000*sizeof(char)))==NULL)
        printf("NO MEMORY");

questions:
1) is 10KB max size buffer tx client http?
2)if I got 180KB+ of free memory..why can't use 15KB or more with malloc?
3) using MALLOC_CAP_8BIT the correct way to know how much free memory got?
Hope someone respond this question
Regards
Gastón