Once a feature is on the map, you can add attachments by taking the following steps:
If the location you tapped has multiple features with pop-ups, you'll see a pivot of those features (as shown in the previous screen shot). You can switch between the pop-ups by swiping from panel to panel inside the features window.
The Edit pivot displays on the attributes panel.
The Choose Picture pivot of the device displays.
You'll see your added image as an attachment. The icon in the upper right corner of the image indicates that the attachment is waiting to be uploaded.
The attachment is saved to the server and to your feature. Since attachments can take some time to upload, the pending attachments and any upload errors can be viewed from the map. When there are pending or failed attachments, you will see notification at the top of the map.
Tapping on the notification will bring up the upload manager. If attachments fail to upload, you can retry or delete them from this page.
If you try to leave the map while attachments are pending, you will be notified that doing so will discard all pending attachments.