Problem with my own server - Iran

### Steps to reproduce

Hi

I live in Iran and these days we have protested for freedom and human rights, and the government suspended the international network. We only have access to the internal network of our country.

~~So I deployed the matrix on my own server to have access to privacy. everything works fine in element web but in the android version, it doesn't load the page when I click on "I already have an account" because you are sending a request to other websites~~ (workaround in [comments](https://github.com/vector-im/element-android/issues/7600#issuecomment-1319581786)).

Also when I'm trying to send a voice message or upload anything using android, I wait too much time and after that, it falls. I think this is because you are sending a request to another URL than my own matrix URL.

All of these issues are not in other clients like fluffy chat.

### Outcome

I expect that you get homeserver address at the first step and all the requests after that send to my own server.

### Your phone model

Xiaomi 11t pro

### Operating system version

Android 12

### Application version and app store

1.5.7 github

### Homeserver

Synapse v1.63.0

### Will you send logs?

No

### Are you willing to provide a PR?

No