Former Immich dev here:

Even in the early days, we got hundreds of different feature requests that “can be done easily”. Even this example is a lot harder than you might think.

• Since all clients work differently, this probably has to be done server-side, requires a new endpoint, caching logic, client support.
• Immich supports a ton of file formats, the solution has to work with all of them.
• We must not lose meta data, quality or alter the image in some other way, Immich is a backup tool, file integrity is a top priority.

If you have an idea, how to tackle all of this, contact the dev team on Discord, they’re really helpful and will surely guide you through the process of implementing.