The implemented handler for sharing into the app doesn't handle ACTION_VIEW, and thus isn't picked up by messengers (in particular, Hermine@THW and Signal).
Looking at the source code of Signal, only the ACTION_VIEW is supported for opening file content.
The implemented handler for sharing into the app doesn't handle ACTION_VIEW, and thus isn't picked up by messengers (in particular, Hermine@THW and Signal).
Looking at the source code of Signal, only the ACTION_VIEW is supported for opening file content.