[Feature Request] Opening Generic Attachments Directly from the App

[Xashyar]

As there are many unsupported file formats including: Docs (PDF, TXT, etc.), Multimedia (see: #2765), it would be very handy to open the files directly without going through the saving procedure.

Other 3Dot Menu Requests: #2757

Expected Result:

Hitting Open or the Attachment itself, would open the file using the System specified program.

Platform info

Signal version: v1.17.0-beta.1

Operating System: Windows 10

Linked device version: 2.30.2.9

[Xashyar]

@scottnonnenberg-signal
If I change the title to Opening File Location (of both supported & unsupported attachments) wouldn't it sit better with the rest of the current design? i.e. simpler to implement?