Also SVG format doesn't being transfered.
Thanks

It's 2024. All browsers support WEBP for some time now and AV1 is around the corner. IMHO it is essential to support those. WEBP already saves 42% in size on average compared to JPEG. Maybe that is why in #1144 the same issue is labelled as bug? 🤓
Why filter on file type at all? If it's in the Media Library WordPress will be able to handle it? But I'm no developer so this might be naive.

Notes from the changeset https://core.trac.wordpress.org/changeset/50810 that implemented WebP support for https://core.trac.wordpress.org/ticket/35725, released in WP 5.8:

• WP supports image/webp if function_exists( 'imagecreatefromwebp' ) or function_exists( 'imagewebp' )
• MIME type is image/webp
• extensions are .webp
• related constants defined by PHP, or by WordPress as a fallback, are IMAGETYPE_WEBP and IMG_WEBP

Notes from current WordPress image support:

• AVIF added WP 6.5.0, 'avif' => 'image/avif'
• HEIC added WP 6.7.0, 'heic' => 'image/heic'

Other notes:

• Distributor's minimum supported WordPress version is "6.4 or later" as of release 2.0.5, so we don't shouldn't have to worry that a sending or receiving version of Distributor is running on version of WordPress that doesn't support webp — We're probably fine to enable WebP by default
• Distributor's minimum supported WordPress version does not rule out versions of WordPress that do not support AVIF/HEIC. Adding support for AVIF and HEIC may require some defensive coding to prevent sending HEIC or AVIF image files to an instance of WordPress/Distributor that doesn't support those files.
• Distributor's filter name prefix is dt_
• Distributor's allowed MIME types are at

  distributor/tests/php/includes/common.php

  Lines 261 to 270 in cf96557

  	function get_allowed_mime_types() {
  	return [
  	'jpg|jpeg|jpe' => 'image/jpeg',
  	'gif' => 'image/gif',
  	'png' => 'image/png',
  	'bmp' => 'image/bmp',
  	'tif|tiff' => 'image/tiff',
  	'ico' => 'image/x-icon',
  	];
  	}

• Distributor also has a dt_allowed_media_extensions filter which has a separate list of IDs
• WordPress' filter for removing MIME types upload_mimes in https://developer.wordpress.org/reference/functions/get_allowed_mime_types/ uses the array format shown in the source of https://developer.wordpress.org/reference/functions/wp_get_mime_types/ of ['a regex' => 'mime/type', ...], which is the same format that 10up's filter uses.

@meksone SVG support and integration with https://github.com/10up/safe-svg seems like it would be a separate issue, since WordPress does not natively support SVG. I've opened a separate issue to track that: #1268