This can happen from time to time after you do an upgrade, or when you try to integrate the Mobile Chat SDK for the first time.
If your Zendesk Chat plan supports file sending (you can check this here), please follow the steps below even if file sending is already enabled in your Zendesk Chat account.
The following should resolve the issue for you:
- Go to Settings, then Account > File Sending
- Turn off File Sending and Save Changes.
- Turn File Sending back on and Save Changes.
- Run your project again.
- Now you should see the attachment icon.
Below you can find a GIF which shows the first three steps to follow:
If after you followed these steps, the issue persists, contact our customer support team.