Videos & photos should compressed similar to elementX when uploading

### Steps to reproduce

1. Where are you starting? What can you see?
Uploading a video via element-web/desktop
Video size loaded in original size causing issues when viewing in EX

### Outcome

#### What did you expect?
Video optimised when uploaded so it can load in EX too
#### What happened instead?
Full size videos uploaded and failing to load in EXI

### Operating system

_No response_

### Browser information

_No response_

### URL for webapp

_No response_

### Application version

_No response_

### Homeserver

_No response_

### Will you send logs?

No

Start by reproducing a video upload through element-web/desktop and compare its behavior with Element X, focusing on the reported full-size upload and failure to load in EX. Done means uploaded videos and photos are optimized enough to load in EX while preserving expected media behavior; no file or test is named in the issue.

Written by the indexing model from the issue text.