What is 'Preserve Alpha' in Affinity Photo?

You see the 'Preserve Alpha' checkbox in several places in Affinity Photo. Here's what it's for and when to use it (and when not!). For related videos, see here: https://changingminds.org/disciplines... There are now online pages for InAffinity here: https://changingminds.org/disciplines... Free resources, including macros, palettes, etc. are here: https://changingminds.org/disciplines... If you are a beginner, start here: https://changingminds.org/disciplines... There is a full, cross-referenced index for every video here: https://changingminds.org/disciplines... To find videos by date of publication, start here: https://changingminds.org/disciplines... To find videos by subject, start here: https://changingminds.org/disciplines... The web page for this video is here (with links to related videos): https://changingminds.org/disciplines...