First time using Rush and was doing well, but as soon as I try to export and render my project from the iPhone app I keep getting an "Unable to render successfully" message. Trying to upload a 2:20s video to Instagram from my iPhone 8+ that is synced with my Rush projects.
I am having the same problem. Just downloaded the Rush app and went through the tutorial. Now when I try to upload media from my phone it will not upload.
I actually figured it out, or at least I think I did. My phone was under 50% charge and that's when it wouldn't work so I tried plugging it into the charger letting it get above 50% charge and keeping it on the charger while rendering and it allowed me to save to my camera roll perfectly this time. Hopefully that helps you!