Authentication error trying to upload image using WordPress 5.8.1 API

I have setup basic authentication using the plugin WP Basic Authentication and confirmed it’s working properly.

The code for getting all the images from the site using the API

<?php

    $login = base64_encode("Username:Password");

    $url =  'https://mysite.org.il/wp-json/wp/v2/media';
    $ch = curl_init();

    curl_setopt( $ch, CURLOPT_URL, $url );
    curl_setopt($ch,  CURLOPT_RETURNTRANSFER, TRUE);
    curl_setopt($ch, CURLOPT_VERBOSE, true);
    curl_setopt( $ch, CURLOPT_HTTPHEADER, [
        'Authorization: Basic ' . $login,
    ] );
    $result = curl_exec( $ch );
    curl_close( $ch );
    print_r( json_decode( $result ) );

?>

Posting using the following code returns the error

stdClass Object ( [code] => rest_cannot_create [message] => Sorry, you are not allowed to create posts as this user. [data] => stdClass Object ( [status] => 401 ) )

The user is the only user defined in the site so it's the admin.

This is the upload code

<?php
    $filename = "IMG_0965.jpg";
    $login = base64_encode("Username:Password");

    $file = file_get_contents( $filename );
    $mime = mime_content_type( $filename );
    $url =  'https://mysite.org.il/wp-json/wp/v2/media';
    $ch = curl_init();

    curl_setopt( $ch, CURLOPT_URL, $url );
    curl_setopt( $ch, CURLOPT_POST, 1 );
    curl_setopt($ch,  CURLOPT_RETURNTRANSFER, TRUE);
    curl_setopt( $ch, CURLOPT_POSTFIELDS, $file );
    curl_setopt($ch, CURLOPT_VERBOSE, true);
    curl_setopt( $ch, CURLOPT_HTTPHEADER, [
        'Content-Type: '.$mime,
        'Content-Disposition: attachment; filename="'.$filename.'"',
        'Authorization: Basic ' . $login,
    ] );
    $result = curl_exec( $ch );
    curl_close( $ch );
    print_r( json_decode( $result ) );
?>

Any help with understanding the problem and how to fix this will be much appreciated.