An issue was reported with not being able to upload photos from an iOS device. We are actively working on a solution, but for the short-term, we have a workaround.
The problem: using iOS 11.0.3 on iPhone 7 or 8, when you try to upload a photo, you get an "uploading to Gigwalk" message but then the photo never shows up and is not actually uploaded.
1) Go to your settings
2) Click on your name at the top.
3) Click iCloud
4) Click Photos
5) Make sure iCloud Photo Library is set to off. (see screenshot)
Now the bug should not affect you anymore.