We are using User token \ Bot token to post the message using chatId.
When Bot token is used it is posted as the Bot and with User access token the message is shown that as the User posted the message.
For a particular use case we want to show the message is posted from an external user and not from Bot \ User
Is that possible to change the display name and avatar when we post the message ?
We created incoming webhooks using REST API to post the message . But it shows incoming webhook icon and name as below
Can we customize the icons and avatar ?