Message attachments (multiple photos, files, other messages for forwarding, etc)

[MurzNN]

Many messengers allow attaching one or multiple media (file, photo, video), when user composing message text, and even other messages (eg for forwarding message from one room to other). But Matrix protocol now only can send one media per message (without text), so if user want to send several photos and text, it will generate several separate messages.

I can't find feature request about adding attachments to message, so create this new feature request.

As implementation, this can be simple field m.attachments, with list of msc:// urls for media, or event_id's for attach messages, eg for forwarding message to other room, in event content. Rendering attachments can be client-side feature.

[richvdh]

related: #242

[uhoreg]

I would encourage anyone who writes a proposal for this to name it something like "Multiple Media in Messages", so that we can have more alliterative MSC titles.

[Half-Shot]

I would encourage anyone who writes a proposal for this to name it something like "Multiple Media in Messages", so that we can have more alliterative MSC titles.

Mmm

[MurzNN]

Maybe MITM (Multiple Items To Messages)? :-D

[MurzNN]

Single attachment to message is popular use case too, but missed now in Matrix (partly implemented as related in edits and replies). So we can implement single and multiple attachments together in one code.

[MurzNN]

Also we can use message attachments for forwarding messages (even multiple messages, like in Telegram), because current forward feature in Riot is simply copy-pasting text of source message to target. Related Riot-web issues: element-hq/element-web#5536 https://github.com/vector-im/riot-web/issues/5952