upload_size_limit.php

<?php
/**
 * Limit max upload size for Caldera Forms file fields
 */
add_filter( 'upload_size_limit', function( $size ) {
    //Check if Caldera Forms submission
    if( isset( $_POST, $_POST['_cf_frm_id'] ) ){
        // Set the upload size limit to 10 MB for users lacking the 'manage_options' capability.
        if ( ! current_user_can( 'manage_options' ) ) {
            // 10 MB.
            $size = 1024 * 10000;
        }
    }

    return $size;
} );