WP Query with categories only shows one post and ignores the category

Try this:

`

                $paged = ( get_query_var( 'paged' ) ) ? get_query_var( 'paged' ) : 1;

                $genral_args = array(
                    'posts_per_page' => '50',
                    'post_type' => 'documents',
                    'cat' => 'your-category-id',
                    'paged' => $paged
                );

                $genral_query = new WP_Query( $genral_args );

                while ( $genral_query->have_posts() ) : $genral_query->the_post(); ?>

            <?php

                //If we have the posts...
                if (the_field ('title')) :
                    while(the_field('title')) :
                        the_field('title');
                endwhile;
                endif;
            ?>
                <?php
                    $pdf1 = get_field('pdf_1');
                ?>
                    <a class="download_button" target="_blank" href="https://wordpress.stackexchange.com/questions/292779/<?php echo $pdf1["url']; ?>">
                        <li>
                            Download File
                        </li>
                    </a>

                    <?php endwhile; wp_reset_postdata(); ?>
            </ul> `

(change the “your-category-id” to id, or if you want choose more category, use thus: 'cat' => 'your-category-id, your-category-id2')