When sharing a picture with the share intent, allow adding a caption before sending

### Steps to reproduce

From another app (e.g. photos), share an image to ElementX. Select a room; then submit.

### Outcome

#### What did you expect?

I'd like to see the preview send screen, where I can add a caption to the image, before sending it to the room

#### What happened instead?

Image is directly sent to the room, without a caption

### Your phone model

_No response_

### Operating system version

_No response_

### Application version and app store

_No response_

### Homeserver

_No response_

### Will you send logs?

No

### Are you willing to provide a PR?

No