Currently Wordpress gets an attachment name from the exif title value for images:

<?php
// Use image exif/iptc data for title and caption defaults if possible.
} elseif ( 0 === strpos( $type, 'image/' ) && $image_meta = wp_read_image_metadata( $file ) ) {
    if ( trim( $image_meta['title'] ) && ! is_numeric( sanitize_title( $image_meta['title'] ) ) ) {
        $title = $image_meta['title'];
    }

Is there any way to save the original filename to the database? I've tried bunch of filters and hooks without any result.

https://developer.wordpress.org/reference/functions/media_handle_upload/

Currently Wordpress gets an attachment name from the exif title value for images:

<?php
// Use image exif/iptc data for title and caption defaults if possible.
} elseif ( 0 === strpos( $type, 'image/' ) && $image_meta = wp_read_image_metadata( $file ) ) {
    if ( trim( $image_meta['title'] ) && ! is_numeric( sanitize_title( $image_meta['title'] ) ) ) {
        $title = $image_meta['title'];
    }

Is there any way to save the original filename to the database? I've tried bunch of filters and hooks without any result.

https://developer.wordpress.org/reference/functions/media_handle_upload/

Possible solution could be to use sanitize_file_name filter to get $filename_raw and insert it to custom table with the sanitized $filename.

To get the original filename later we just need to query the custom table while comparing sanitized filenames to attachment filenames.

Am I right or is there any other way?