For images, we use @Laird's Image Auto-Resizer. We don't allow any video type attachments, although they can link. Either using the embed feature, or just a URL.
Laird's Image Auto-Resizer works well enough for jpeg, where pixel scale is the big issue. Png - not so well.
Laird's Image Auto-Resizer works well enough for jpeg, where pixel scale is the big issue. Png - not so well.