feat(mobile): share to mechanism

[alextran1502]

Closes #2659

This PR adds "Share to" option to the mobile app. This feature helps users who want to quickly upload media to their Immich instance without saving the media to the gallery first.

ScreenRecording_01-10-2025.13-05-53_1-1.mov

Caveat

When initializing a share action, iOS will default to using the most compatible format, so the HEIC file will be converted to JPEG unless the user changes the settings from the native share sheet before sending the action to the Immich app.

TODO

• clear file cache

[mertalev]

I think it's important that it warns you if the images aren't the originals or the location metadata is stripped. You don't want people using this without realizing that Immich isn't getting the original.

Also, how does this handle live photos on iOS? Is the video transferred as well?

[alextran1502]

@mertalev

I think it's important that it warns you if the images aren't the originals or the location metadata is stripped. You don't want people using this without realizing that Immich isn't getting the original.
Also, how does this handle live photos on iOS? Is the video transferred as well?

You cannot reliably do this without reading the file EXIF metadata. This is not a primary use case for this feature. This feature allows you to upload quickly from a webpage or another messenger app without saving the media to your library.

LivePhotos only sends the image part.

For full file backup with a single selection, we will use the in-app picker mechanism like this https://github.com/fluttercandies/flutter_wechat_assets_picker which will integrate well with photo_manager's data type used across the app. I plan to have this in perhaps after this feature so we have all mechanisms for all upload use cases