To upload a file that is not a photo to Amber X, please follow the steps below:
Find the desired file. Click Share > Amber iX.
Click Save Here in the bottom right. It will be saved inside 'third party' folder located in the Offline Folder.
Go to the Home tab, tap on Offline Folder > third party. Tap on the Options button and tap 'Upload'.
Tap on your desired Amber X, then tap Upload.
Your file will be under the Uploads folder in your private home directory.
You can tap on the [center] Amber tab in the iX mobile app. Then tap Files > home > Uploads.